You are going to have to do some digging and I'd suggest you start by getting the 05 and 06 FSMs and parts manuals from Sam's NOOB site (05 FSM lacks diesel cooling data and diagnostics cut has illustration keys while 06 is the reverse).
What I know and/or am willing to speculate about:
1. front and rear seats should interchange between same year gasser and CRD. Rear seats would be just a bolt and go. Front seats are a bit different. At least the passenger seat has an airbag sensor that adjusts air bag deployment based on weight in the seat so you probably saw chat about moving that sensor when installing earlier model seats. Power seats with or without heat are, I suspect pretty much self contained in that the power and heat need power run to them. I don't know where the switch for heated seats is but for power adjustable seats the switch is on the seat and all you would need to do is make it "hot" to work. I suspect you could direct wire but if you can get the harness with the donor seats then by all means do so although I suspect you could splice into an existing circuit to make them work. NOTE - see
viewtopic.php?f=5&t=62506 - looks like the air bag sensor may be coded to the vehicle and has to be swapped.
2. some AC/Heat parts interchange and some don't best consult the parts fiche. For example the dash controls are the same and I suspect the ducting is but the compressors are not, don't ask me why, and I have no clue about the condensors.
3. radio controls should be movable from gasser to crd - I know I've seen a post on how to but unfortunately I did not retain the link or recall who did the post. You might just post that question.
4. cruise - I have no clue how gasser/crd cruise operates but I suspect to wheel mounted controls are the same although the other end my be entirely different. I do know that if you add cruise it won't work unless the ECU is "told" to turn cruise on.
Best I can do.