Might depend on which year, but there was no difference between my 90 4wd 1500 and 90 2wd 2500. Holes were drilled in different locations in front and may be formed slightly different, but without pulling out the tape and protractor, I couldnt tell you how far off. Unfortunately I dont have the 2500 anymore, so I cant go get the measurements for ya.
But then again, I could be way off and I'm sure I'll be corrected if I am.