They're different shapes for sure, the '21 tank has a square back, the '28 is like a launch ramp. It may well "fit", a mk2 escort bonnet fits a mk1. Wheather it looks right is another thing, and depends on how you define "right".

Personnally I like the little vents either side of the '28 lights, but then again I like the SS swingarm

I believe the bottom and mid panels are the same, I chuck mine in the van and we'll double check.
_________________
Please do not PM me technical questions, if you can't find it on the Forum start a thread