Interchangability of parts question

[junker68]

My daughter's 1987 300SDL (w126) was in an accident the other day, where she rear ended another car (she's fine).
The damage to her car was to the driver side headlamp area. Heavy damage to the headlamp, hood, grill, radiator and the cross brace that goes across the top of the headlamps/radiator.
The bumper and the fenders were untouched. So, structurally it appears fine.
There's a 1984 300sd (W126) for sale nearby for $700.
Does anyone know if the 1984 parts, described above, are 100% interchangeable with the 1987?
I may attempt to repair this if I can get all of the parts I need at one time and not have to spend half my life buying a piece here and there, waiting for parts to arrive.
I'd post a photo but every time I try, I always have issues.
Anyway, thanks in advance.