i'm installing an entire engine with wiring into the engine bay. Just need to confirm that I can still use the same internal wiring - dashboard, interior stuff.

turbo is TD04-15G

Just purchase a 850 96 t5 engine and planning to install into my current 850 96 GLE. Changing the entire engine bay wiring to T5. Do I still need to change the internal wiring or can I use the existing GLE internal wiring since both are OBD-II. Thanks.