Are they worth testing?
Yes they’re worth testing because although video pins for some, and static pins work for others, carousel pins could work for your business too.
Should you use promote different products in a carousel or should you use different images of the same product in the carousel?
You can test both.
Make sure to use the right link for each picture if you are promoting many products in one carousel.
You can test linking to a product page as opposed to 1 product, but normally I’ve seen product pages be less successful overall in Pinterest Ads.
What are the Pinterest Best Practices for Carousel Creatives?
Same as all other creatives: they should be 2:3 and contain text overlay, call to action and branding.
Do they have to have all those elements on each slide?
Not necessarily. You can get creative with the text overlay, you can test also test only adding the CTA on the last slide. As well, you can add the branding on the first slide only too. This is something you need to test.
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