door difference in years

[warbird1]

i have a 1972 chevy long bed that i just picked up as a project. the drivers door has been replaced with (i'm guessing) an earlier year. it has a metal interior panel whereas the passenger side has the plastic interior panel and plus the color matches the rest of the truck so i can safely assume its original...my question is.
i like the metal interior panel and im wondering if i can purchase earlier style metal interior panel and will it fit the 72 door?
2nd question is. i notice that in all the parts listings i see they note a different PN for the window regulator between 67-71 and 72....anybody know the differences in the doors? and whether i can retro fit a 1972 door to fit the 67-71 hardware?


thank you in advance