Carrying this over from here as I just realized that’s the Tech forum where we’re not supposed to clutter up threads with extraneous content.
A month or two ago I was testing out something unrelated so was pinning the same product link w/ same image/vid but in different formats and either manually or automatic Shared. I was using the Description field to note what I was doing on each one. But I very quickly discovered that my personal titles & descriptions were being reverted to Zazzle’s default within minutes of posting, which meant I couldn’t easily compare results without having to go in to Edit on each pin and look at my custom text fields there. So I abandoned that test out of frustration, deleting those pins, but my feeling then was that hmmm, first original pin of something retained my own personal title/description but subsequent pins of same thing reverted to Z’s default. After some testing these last few nights, that only partially kind of pans out. My TLDR (Too Long, Didn’t Read) summary is that Pinterest just randomly does things and we and probably not even Zazzle can control what happens to our Pins.
For anyone interested, here’s the details on how I was trying to test things out.
Here’s a marked-up screenshot of my Shop Col’s Creations board.
When I manually pin something I use the Notes field to record the where/what/when of the pin since Pinterest makes it impossible to figure out later. (Forgot to do it on the backpack though so don’t know what date I pinned that.) SO when you see ‘Manually created pin Posted …’ that’s my private pin Note viewers can’t see.
Pins that have reverted to Zazzle’s default show ‘Zazzle’ above my user name so I can tell without even clicking each pin that it’s been reverted.
I took this screenshot yesterday. For the duffel bags, pinned just days apart, the first one I pinned 4/2 had reverted but the second one on 4/5 had not. Now today, less than 24hrs later, the 4/5 duffel has also reverted to being Zazzle’s default. Why? Absolutely no idea.
The wedding cake invite, that was my first test. It was a new product manually pinned by me, manually uploading my custom cover image to it, on 7/3. I picked this one to re-pin as I found it unlikely anyone else has ever pinned this product with this image, or re-pinned it. So I made another manual pin yesterday, uploading same image and using same link, to same board, and as soon as I refreshed the Pin after posting it, it reverted to Zazzle’s default description. Meanwhile, the original pin from 7/3 still shows my custom description. So then I made a duplicate pin of another product but this time I posted it to a different board than the original. That one retained my custom description. Until I used Edit to move it to the same board as the original and then poof, instantly reverted to Zazzle’s default.
Then I did the tie pins. That’s a Direct-Only product I made to show how the design repeats so I know it’s never been pinned before even by me. I downloaded the image from Zazzle and uploaded it to a manual pin I titled “Tie - Test Pin #1”. Then I made a duplicate pin but titled it “Tie - Test Pin #2”. (In the above tests I used the same titles which also happened to be same title as used on Zazzle). Neither of those pins reverted. So hmm, I changed the title of the second one to “Tie - Test Pin #1” - exactly same as first one - and poof, it reverted to Zazzle’s default. So I thought maybe I was on to something with exact-same titles, which would happen with multiple people (affiliates) pinning the same thing using the same title as copied from the Z product page. I deleted those first two pins to try another take.
This time I created the manual pin and titled it “Tie - Test Pin #3”. (#3 in the screenshot mark-up). It retained my custom title & description. Then I made a duplicate pin, titling it the same - “Tie - Test Pin #3” - but posting it to a different board. As above, it retained its custom info, but unlike the above case, when I moved it to the same board as the original, it did not instantly revert this time. (#4 in the screenshot mark-up). Then I pinned it a third-time with same title, but directly to same board. (#5 in the screenshot mark-up). This time it didn’t instantly revert, but within the hour the description did revert to Zazzle’s but while retaining my custom title and without showing the 'Zazzle" underneath it, as in above screenshot.
Now today, the title of #5 has also reverted to Zazzle’s default, but still no “Zazzle” on it. Meanwhile, pins #3 & #4 still retain my custom title & description.
And if you look at the screenshots of my old pint glass pin in the above referenced thread, that one started as a normal manual pin w/ my custom description which at some point converted to a type of shopping pin with multiple images pulled from Zazzle and then converting again to the weird inbetween type pin it is now. And it’s the only one of my older manual pins that has been reverted/converted so there’s no rhyme or reason to any of this I can find.
So in a nutshell, all this testing proved absolutely nothing other than the unpredictableness of Pinterest behavior. 
I do think however that there is something to the inkling notion that using a unique pin title (rather than the default product titles another affiliate might be using to pin same item) might be helpful.
Final thoughts: pin your stuff and quit worrying about what Pinterest is doing to them as we can’t control it. If I’d been pinning stuff the last two nights instead of trying to figure out a method to their madness, I probably could have pinned everything in my shop already. 
But all was not a waste, at least now I feel like when I want to pin something i don’t need worry about the “right” way to do it as there doesn’t seem to be any right way and even if there were it would be different next month anyway.
