That part of expansion is at least identical over all versions, i.e. decoding of the Z-III extended flags in the config defs. It would not make much of a difference anyhow as the A2000 does not have the ability to address anything beyond the 24-bit space on its Zorro.
Well, since there are different model specific versions of expansion.library it certainly implies that the model specific memory maps are an issue. But even if this is not an issue for the latest versions of expansion.library it could be for older library versions.
... and even though the A500/A2000 motherboards are limited to the ZorroII 24 bit address space accelerators with 32 bit CPUs can access 32 bit local bus hardware which could be implemented in ZorroIII format.