Shock plate differences?

I see brewer sells reconditioned plates for 8 3/4 and Dana.
I see 2 different part numbers. One looks like the 8 1/4 plates I have. The ones with the rounded indentations look like the 8 1/4 plates I have.

View attachment 1715640925

View attachment 1715640926
The bottom pic is 7-1/4” it seems