It could be done but wont be just a straight swap, for a start your motors have resolvers and tachs which suggest that the drives (Amps ) will be analogue, that is no use for Mach. Rutex do a Step/Dir to analogue converter but so far I have not seen anyone that has used one. DSPMC do a motion controller that can control analogue drives and it seeminly works well but it is fairly expensive. You will also have a lot of figuring out to do but as has been said you could convert but not just a case of plugging it in.
Hood