not sure why smag use a different motor but I would check the specs of both the smag unit and the replacement
was wondering why the smag motor was so expensive and it may be either quality ot it could be increased air flow
look at specs on motor wattage or air flow
if the unit is being vented outside be aware of the outlet hose sizes. did some guarentee work for one manufacturer and we were instructed to check the hose size and if to small to walk away and void the warranty
did not want you to replace it and find the new one is not as good
Dave