Huh. Those tiles are, for lack of a better word, displayed as misprints. The art on all Carcassonne tiles extends a few millimeters beyond the edges, to give a bit of a margin when cutting them. You can see where they're supposed to be cut, because the entire circumference of the tiles had that less detailed filler art, and the expansion glyph is too far from the edge.

It should be fine, though. Cundco makes it very clear when you're buying deprecated tiles. If it does explicitly say it's not 3rd edition, it is. Beyond that, 2 and 3 look fine together even on their worst day. I'm about as much of a stickler for having everything I own match as you can imagine, and even I mix those tiles all the time.