I noticed in the sales brochure for the Ryker that it indicates that the Rally edition has a Rally seat. Can anyone shed light on this?

The side profile looks a little different.
Go to the website (https://can-am.brp.com/on-road/ryker/recreational.html) and switch between the two models by mousing over the models. Look at the seats and you will see the difference. I am not sure if it provides more padding over the non-rally version or if it is just pure aesthetics.

Sitting on both at the dealership the Rally seat is far more comfortable for me, but I ordered the Comfort seat as well. The rally seat has more of a defined rear support also.