The front seats, rear door panels, and the carpet will fit. The front door panels have a different top front corner, and do not match the side of the dash. If you can swap the front top corner of the front door panels with your old ones, you can make them fit. The colors of the 91 will be different from the 94.
The rear seats and cargo area will only work if you install it as an entire unit. You may have to do a couple of mods to fine tune it. the mid seat has a different mechanism that is not compatible with the 94+ cars.
What is the interior color of the OCC?
Does the donor OCC have any good cladding on it?