10" drum brake swap for BP change

did the 10 x 2 and the 10 x 2.5 use the same backing plate? if so you would think a guy could use 2.5" shoes and hardware then get a 10 x 2.5 drum with the bbp (as you already have) and bolt everything up using the axles set up for the b-body offset. it all boils down to the offset of the baking plates.