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speaker size is the same for both, but the impedence requrements are different. Don't put just any car audio speaker in you door of your mach system....
Yeah if you do have the mach dont just buy some aftermarket speakers and just throw them in, the impedence(ohms) is different. And too if you do have the mach and it isnt bypassed your not going to get any better sound, it will be loader bc the ohm load is now lower but you just damaging the amps slowly.