What are the differences between the two available pizza elements? In the "Buy pieces" section of the Lego website, I looked up the pizza element. It turns out there are actually two of them!

Element 6102555 costs $0.41/piece and 81867 costs $0.37/piece, but they have identical images on the website.

What are the differences between these pieces, if any? (Other than the fact that one is 4 cents cheaper than the other!)
Bricklink tells me that 6102555 is Tile, Round 2 x 2 with Bottom Stud Holder with Pizza Pattern and 81867 is Tile, Round 2 x 2 with Pizza Pattern which according to the 3D model is the old style with the X on the bottom. Other than that, they seem to be identical.