The main thing that needs to match with the cabinet is the woofer. Beyond that, the crossover is critical. The slopes is has might not be optimal or even conducive to the new speakers you’re selecting.
Honestly, it would be best to find original drivers (ebay). Barring that, it’s easier to just buy something else than spend money on something not even knowing what kind of outcome you’ll have.
Regards,
Wayne A. Pflughaupt