With Tasty Pins, you’ll have the ability to add a Pinterest Repin ID to each of the images within your post. The Pinterest Repin ID enables you to link Pins from your website to existing Pins on Pinterest.
After you set the Repin ID for an image, the existing Pin on Pinterest will be re-pinned instead of saving a new instance of the image on Pinterest. That way, your existing Pin gets more repins which is useful because Pins that are more popular are more likely to show up in search results.
You can read more about why repins are important and the Pinterest Repin ID field here: https://www.wptasty.com/blog/pinterest-repins