friend works at mazda dealership, part number is slightly different from the cx7 turbo.
Heres what i read on some other sites:
"There are differences bewteen the two turbochargers. One is the exhaust housing is way smaller on the CX7 and also the compressor wheel is smaller. The housings look physically the same but once you get close, you will see differences."
"not the same turbo.... that cx7 turbo has smaller dimensions for increased low and mid power, it will run out of breath early early. you can run the same psi, but you will have much less cfm. someone recently went through this with dropping a cx7 engine in a ms6"
"the cx7 has a smaller compressor housing."