Do all gen 1 sheet metal interchange?

[Big-mike]

I have found a gen 1 truck. But unknown of the year. I do have the vin plate picture.
So does all gen 1 parts work with each other?

 

[u2slow]

There's some dependencies, but for the most part, yes. (72-93 era).

 

[David Vandercook]

81 to 93 the only body parts I know of that are different are door latch pins were fatter before 86 and the doors were ever so slightly different, but still compatible, the grill was different before 86 and after 89 I think, the tailgate changed in 86 also but still compatible.

 

[GTyankee]

Look at sheet metal parts from the companies that actually make the parts.

Most companies buy those parts, others sell used parts, like:
LKQ

2 automotive body panel companies are

https://www.millsupply.com/
&

https://raybuck.com/

they should have differences of Heights & Widths of things like
Doors, Fenders, Hoods, Grilles, etc.