The micro-emag sear is just an emag sear with the bushing cut so that is doesn't stick out past the side of the sear. It is then drilled out to accept the larger sear pin.
You may be able to operate the emag lowers on a micro-mag without the spacer plate with some adjustments in the lowers. The sear pivots in the body on the micromag, so only the solenoid plunger and trigger rod is really affected when it comes to the spacing differences between bodies.
Except for the Automag in front, its usually the man behind the equipment that counts.