Ultimately(bahahahaha get it?!?!?!?!) there are similarities but the goal for disc flight and form are pretty different. In ultimate you are trying to pivot as far out as possible and get your arm to reach out as far as possible to make your defender have a harder time d'ing your throw and cutting off the angles you have on your throws, the anhyzer (outside-in for ultimate) is the go to shot in ultimate because you don't have to bring the disc across your body, and when pulling the idea is to keep the disc in the air for as long as possible so the defense is able to get down the field and set up or even cause a turnover right off the bat.
After playing competitive ultimate for 5+ years(and continuing to do so) through high school, college, and at the club level, what helped me most is learning to predict disc flight, body and arm control, and make other environmental observations. There are things that you can draw from one sport that will help you with the other but My forms compared between the two sports are fairly different because of the different goals that in each.
I could elaborate more but I will save you all from my babbling XD