The Rabbit 4000 (and above) has a Rabbit 3000 compability mode (bits 7:6 of EDMR register).
When in Rabbit 3000 mode, the Rabbit 4000 uses the Rabbit 3000 main page of instructions. Clearly, Rabbit 4000 instructions ont he main page and on 0x7f page are not available.
However, I wonder if a Rabbit 4000 in Rabbit 3000 mode can use Rabbit 4000 instructions that do not conflict with Rabbit 3000 instructions, e.g. cp hl, de on the 0xed page.