^Note the seat in the '80 Special compared to the ones in gggGary's posts. The '80 Special seat is one year and will fit on '81 and up. It's flatter and more comfortable and better looking. Speaking of switching parts around
Yes, the seat from the '80 Special latches right onto the later models. Whether it's better looking or more comfortable is purely subjective.
Here's my '81 with '80 seat and side cover badges.