What is the difference between the Hasegawa VF-21 and VF-22

[Steve68]

What is the difference between these two kits. As I understand it the 22 has an extra sprue, but what does that sprue contain?

edit: I meant the YF-21 and VF-22.

Thanks,

Steve

Edited August 25, 2007 by Steve68

[Nexx2]

The canopy is different.

The underside has also differents details (like sort of 2 guns under the vf22)