I'll let the BMW guys confirm, but I think that is the case. The M50 and S50 were the 2.5 OBDI and 3.0 OBDI motors that went in the early E36 325s and the 95 M3. The M52 was an OBDII 2.5 and the S52 OBDII 3.2 in the M3/Roadster/Coupe.

I THINK all of the E36 325s are on the same spec line, allowing use of the early manifold on all cars.