If it's a similar bodystyle, all doors from a 1980-1990 Caprice would be interchangeable.
Doors from a 1977-79 Caprice or Impala would be interchangeable.
It is very possible i have seen it done dozens of times.
Any door from a 1977-79 Caprice/Impala would fit (assuming it's a similar bodystyle)
No.
As the 1993 did not have the motorized shoulder belt system but instead had air bags the front doors on the 1990 are not interchangeable with the doors on the 1992-93. The passenger rear doors should be interchangeable.
yes they are
1988 is new body style, the doors are not interchangeable.
Yes. They are the same frame. The body parts, i.e. the doors are designed around the frame, so it is capable of being both a two and four door model.
Yes, the doors and windshield interchange as follows: 1984-1991 windshield interchangeable. 1984-1987 2 door LWB doors interchangeable 1984-1987 4 door doors interchangeable 1988-1991 4 door doors interchangeable 1989 SWB 2-door doors interchangeable with 1988-1991 4-door front doors and rear barn doors. note: pre-1988 4-door doors will fit 1988+ mostly, but the lock mechanism has a different retaining hole. but the newer locks can be re-keyed to match the older keys, and vice versa. you just can't put the whole lock from one into the other. There were also 5 distinct hinge redesigns which make door fitment slightly different with different years - for example the hinges from a 1986 would swing the doors too wide on a 1991 and allow little kinks from the interfering sheet metal.
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The doors are not the same.
91-94 is the same