We aren't talking about a plain 1948 Ford pickup frame here where they are rectangular simplicity. We are talking a very complex frame under your Chevy. And if you think "body mounts" are the easy part, pile that on a list a mile long from steering column mounting to bumper mounting, to the floor hitting the frame the rad support needed to be cut up to clear the frame.
"Can" it be done, well certainly, but so would be using the fender on from the Ranger on your Chevy, you COULD modify the fender from the Ranger to fit, but it would be much easier to make one from scratch.
There is no such thing as a frame "swap" using the wrong frame, is using the wrong frame. What it does is "swap" money from your Chevy frame to the Ranger, "swap" time from your Chevy frame to the Ranger, and "swap" work from your frame to the Ranger frame.
What are you after with your Chevy, what are your plans?
This a '94 Ex cab frame. It could fit, but really not worth it.. Also note. '94 Front suspension is twin I beam which was introduced in the mid 60's. A system that works well, but is not the best
Ford Ranger rear end would have been a good idea 15 years ago, but now. Explorer rear ends are so plentiful and cheap, there is no reason not to use 1. 31 spline 8.8", disc brakes and they are only like 3 inches wider than the 83-'92 rears, and 1.5" wider than '93+