Answer by DugelStudios

Looks like there is no quick and simply way to do this. I'll just write a generic script that can blend any 2 tiles without creating custom transition images and put it on the asset store. I'll update this answer once It's on the asset store. EDIT: I have finished the asset, here is the promo video: https://www.youtube.com/watch?v=JwcjsqDHu0c