Germany 2002F coins look quite different?

Hello all! I have two German 50 cent Euro coins, 2002F and they have a few differences. Mainly it appears that one of them is noticeably thinner than the other and the reeding on the outside is thicker on one compared to the other. Why would that be?

Same thickness (within normal variation) and same reeding. One is just worn more than the other, rounding off the edge.

Thank you! I really need to buy a measuring tool… 😑