UPGRADING A T3 TO TSPIRIT

Hi everyone!
I have a 2006 Spirit that's on its last legs and have seen a T3 that looks like a good replacement (very low budget) but obviously lacks some of the bells and whistles.

My question is this:
Is the basic wiring harness in Gen 2s the same, with just the accessories added or deleted dependent on model, or does, for example, the T3 have its own dedicated harness.

I'd like to be able to extract some of the goodies from my Spirit and install in the T3/T4.
Am I dreaming here?

Cheers
John