Is there a larger armrest??? If so, that would be a great swap!
Sure looks like the same seat design, with small differences in the covering design. Armrest looks like it's the same size & shape as the Sonic to me.
It'll be interesting in time to see what interchanges in these seats. In the Saturn S-Series, I've been able to swap the seatback frames in order to put lumbar adjustment in passenger seats, which was only ever offered in drivers' seats. Most of the seat parts swap around like legos. (I never bothered with swapping the seat base adjustability, as it would've required cutting, welding, and possibly fabricating unique parts.) Of course, the S-Series seats didn't have airbags in them either...
There's a chance that the tilt mechanism in the passenger seat may be designed as a separate part that could be swapped directly onto Sonic seats. We won't know until someone can get their hands on some & do some dissecting. We'll probably know a lot sooner if it looks like the seat mounting looks the same to allow for full seat swaps between Trax and Sonic.