Earlier this year, I talked to Customer Service about this same thing. I was told that the transducer was the same.
By trading it in, you get the TM mounting kit basically without paying for it except for shipping. You can also just pay the $35 + shipping and get the kit and keep your transom mounting hardware.
I opted for the more expensive Transducer Shield and Saver as I was leaving soon for a fishing trip and they could get it to me in a day. I ordered on a Wednesday, installed on Thursday, tried it out on Thursday and left for my trip on Friday.