Do the 2.5 sets work with the other worlds sets? Would it be noticeable if you used characters from both?
Viewing post in 2.5D Character Pieces Vol. II comments
The pieces are NOT compatible because the two different lines of assets use different animations for characters and slightly different size scales. However, characters made with 2.5D assets can be used alongside characters made in Other Worlds, they will just have a slight size difference but not so much that the characters look incompatible.