Can you swap out a 1984 Porsche 944 wiring harness with a different car's wiring harness? If which car. Thank you.
You can order a new 944 wiring harness, but it is a lot of work. Much easier is to just get a good manual with a wiring diagram, and replace only the damaged wires, splicing at little as possible, as you go. I assume you just have some heat cracked wires, unless you had a fire or something? You can't take the harness from another car because all the connectors are going to be the wrong type, gender, or location. Especially things like the brainbox harness plug, etc.
Could it be done by someone with tons of experience? Sure, but why would you? You would spend hours upon hours patching things and cross connecting. The fact that you are asking this question means you don't have an iota of mechanical or wiring experience making the point moot. So for you? No. You can not swap out the harness for some different cars wiring harness.
Porsche 944 Wiring Harness
Sure. You are going to have to make a lot of patches to the other wiring harness to make it work.