I'm debating whether to switch out my front seats to 04+ or switching in a driver/passenger heater switch.

So here are my questions:
-Am I going to lose power/heat functionality if I put in 04+ seats?
-I heard somewhere that even if the 97-03 passenger heat switch is not available, the passenger seat still has a heating element. True/false?

BTW, if I find a good set of rear seats, I'm going to switch them in.

Or if anyone has any other suggestions, they are welcomed.