AFAIK DMAC -04 will work with RAMSEY -04 but DMAC -02 will not work with RAMSEY -07
If you have the rare DMAC -04 then you could and should get a RAMSEY -07. They should be cheap as they were made and used in A4k (whereas the DMAC -04 is very rare and expensive).
DMAC -04 and RAMSEY -07 is supposed to be the best combination for using accelerators.