In need of some help.

I need to know if the drive shaft out of a b2600i can work in an 88 B2200. I know the slip yolks will be different, but can I use the rear section of the two piece? the reason im asking is cuz my rear u-joint went on my truck and it messed up the piece that bolts to the rearend and I can get a b2600i thats in decent shape for next to nothing. any help would be appreciated. and also how different is the driveshaft for a b2000?

Oh and my truck is an ext cab the b2600i is also ext. and i know where a longbed b2000 is

i beleave they are the same on the axle side..i put a slip joint on my truck from a 2600i 4x4.. but dont remember if i had to swap rear yolks..dont think i did