Difference in 04 to 05 Piston

Anybody know the awnser? same cylinder and Crankshaft. I have an 05 yz 450 and the thumpertalk OEM store didnt have a fish for an 05 so I gambled and parts will be here today but now I see they are different.

The online Yamaha Parts catalog lists both pistons with the same PN.

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