Hello. I have a 1995, non supercharged model,now over 200k miles and the opportunity to buy a supercharged model engine. How difficult a replacement is this?

Good news. Just talked to gmtuners and they have compatible software that will work, so I’m going to give it a try and see how it works out!

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'96 Bonneville SSEi - White on Teal - ZZP Stage 1 Kit, 3.6" Modular pulley, ZZP ported TB w/spacer, L3 short ram intake w/K&N filter, ZZP Power Log, ZZP DP w/high flow cat & 97+ manifold, ZZP SC coupler, ZZP HV ignition coils w/10.5mm plug wires, 16" Gold crosslaces w/Yokohama Avid tires, Olds LSS T-handle, Sony HU.

2000 Buick LeSabre Custom - Daily - Sony double DIN headunit, ZZP plug wires, ZZP TB spacer, L3 short ram intake - Dark Bronzemist Metallic on taupe

Compatible software for 1995 model? For tuning? That is good news.

To answer the OP question, anything is possible with enough time and money. To keep it as simple as possible, swapping the driveline from the same model year will provide the fewest headaches. You would need the wiring and PCM etc too...