In my experience pretty much anything from any Chevy or GMC will interchange between trucks, Blazers, and Suburban, providing you don't go too extreme. I don't remember exactly what years interchange with yours but I think the body style change from 1988 should be compatible.
My truck is a 1990 model and had a 60/40 split low back bench that the fabric was shot and was not terribly comfortable. I went a bit more extreme and while I was replacing the seats in my wife's Dodge Durango, I grabbed the best parts I took out of her truck and built myself a better driver seat. I lost the tilt forward ability, but got a high back reclining leather seat with lumber support, and I only had to drill two new holes in the seat bracket.
The next time I was at Pull-a-part (the best place to find good truck seats) I ran across a Dodge from around 2000 that had a split bench seat that I thought would look good in my truck. This time I had to piece together several seat brackets and custom build some mounts and run some new wires for the power driver seat. Now I have the best of both worlds. Both the 6 passenger capacity of two bench seat extended cab truck, full access to the back seat and a fold down console. You even have to look close to notice the front and back seat aren't the same fabric. This may be more work than you want to get into as a bench from a mid to late 90's Chevy would most likely bolt in with the possibility of drilling a few holes that aren't there and plugging the ones that are.
