Does anyone have an idea how to visually identify whether or not seats have the seat heater/warmer option?

I am going to look at a used pair of 996 Sport Seats with the hard backs. They are power adjustable, but do NOT have the embossed Porsche crest in the head rest. My car has the seat heater option and I want the seats I buy to have them as well. However, my car is in storage and without physically being able to plug them in, is there a way to see a specific wire or plug for the warmer function if it's even present?

Any help is appreciated.

 

Look under the seats. There should be wires coming from both the seat cushion and the backrest cushion. Also these connect to a relay located under the seat. If they don't have then the foam pieces could be switched from your existing seats. The backrest is only heated in the center, the foam is the same. I think the seat base foam piece is also the same. The main difference between comfort seat and sport seats is the larger bolsters around the backrest.