Automatically align pasted content if it matches the image below

Often I'm working on screenshots for documentation, where you need to go back and forth from the application to photoshop, and update small sections – especially where you have made a mistake, or such like.

What would be really useful would be to be able to just paste, and have the pasted content automatically paste into the right place, without having to manually nudge, change the opacity to and from, etc, etc.

If the content looks similar, or looks like it could be a portion of the whole, just place it in the right place.

Maybe it would be called "Smart Paste" or something.

Thanks!