The 90-93 doors had the additional latch on the top of the door. You'd have to swap the knob on the door over to the 94+ door, provided the hole is still there. Also, I can't find the post right now but sometime in the last few weeks there was a post showing a thick bar running through the 90-93 doors that was not present in the 94+ doors. I don't think it's known whether or not that was directly spawned from the seat belt change and it's impact the safety of the vehicle could be an issue.