If the 99 PCM is tried in the 96 and all else is ok, the engine should start, but cut out after two or three seconds. There's no SKIM (Sentry Key Immobiliser Module) wiring in the 96 so the key sensor can't be swapped over.
WARNING! Too many start attempts without SKIM input could brick the 99 PCM.
Trying the 96 PCM in the 99 shouldn't present any great problem. The normal recommendation (in the USA) when swapping a non SKIS (Sentry Key Immobiliser System) PCM into a SKIS equipped model is to unplug the SKIM at the steering column. I'm not sure if that is necessary with a 96/97 PCM that doesn't have SKIS capability, but I think I'd do it anyway just to be certain there is no risk of problems.
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