No, the distributors are not interchangeable.
MegaSquirt will use the MAP only, as far as I know, they didn't support
a MAF which the 16V has, but as far as turbo, the stock ECM seems to
handle the boost just fine, the only advantage, if you want to call it that
would be the ability to tune the MS, and if it is the MS2 it has multiple
tables that also control ignition and has a boost retard also.
The MS will require you to use GM sensors or you will have to use easy therm
to calibrate the table for the coolant and air temp sensors, not that hard, just
something else you have to do to get an accurate injection table
Wild