The DX hatchback has a D15B7, most D series have subtle differences in how the hook up from year to year even with the same exact engine. So if you swap in another OBD 1 D series that is not your exact engine it will be close but not exact.
If you're looking to swap in a B series, you'll need every bit of wiring and sensor off of that B series if possible, it will not B direct. Same goes for going with a OBD2 D series, the wiring will be quite different, even the intake and other little bits will be different.

Also vast majority of engines past emissions if they are in good running order, you will fail if you're engine is running poorly because it out of tune (numerous possibilities), it has low compression, or burning major oil.
BTW if you look at the top left of the engine block (left exhaust manifold) you'll see the engine Identification stamped there.