Me han rechazado contenido vectorial que me había aceptado previamente con formato distinto

It's never a good idea to delete accepted assets to modify and resubmit. You did learnj it the hard way. 

This is not Adobe contributor support, and except for confirming that this may happen, we can't do anything for you. Even resubmitting the originally accepted file may result in a refusal.

Stock Reviewers never visit this user-to-user community.  They're too busy examining thousands of assets.

There is an old American saying, "if it isn't broken, don't fix it."

You fixed a problem that didn't exist. And now you're stuck with the consequences. 

This is what Stock has to say about 'similar content.'

• https://helpx.adobe.com/stock/contributor/help/how-to-submit-distinct-content.html
  
  

I've deleted a couple of assets in the past only because I discovered errors that the moderators overlooked. Otherwise, if something gets accepted, leave it, as @Jill_C mentioned. I didn't see the rectangular assets you deleted, but square assets should often be avoided, as they leave no room for cropping or for adding text.

If this is about Adobe Stock, you can ask it there, or we can move your post:

https://community.adobe.com/t5/stock/ct-p/ct-stock?page=1&sort=latest_replies&lang=all&tabid=all

El problema es que tengo más vectores con el mismo problema