I have not finished installing my trim pieces yet, and actually prefer my 93 gray color better than the later two grays. I have mixed my old/new interior based on what I liked better for my work truck. I have the 93 front seats and 99 rear seats in the 93 body, 98 door panels, the other interior trim will all be the 93, it's a more attractive gray. I'd like to have used my 93 rug, but the green shading of it isn't as good as the 99 dark gray.
The dash is the big thing that you cannot change, it's mounted far differently. The sizing of everything is the same, the space of the cabins is the same from 91-01. But a few mounting changes were made, mainly for the dash and console.
FYI, throw your side mirrors away and buy some good used 95-01 OEM mirrors. They bolt right on and look far better. The wiring connectors might need a quick swapping of wires, but it's all the same otherwise. Good luck,