They are different belts, the rear ones sit horizontal, and the front ones sit vertically. The belts from a 90-93 coupe and hatch are the same thing, so either one will work if you find some.
And Mike, if you still have the black 3 point belts from your parts car, you can make them fit in your hatch. I did it on mine and they work fine. I did it before I changed to the 90 interior, so I bolted them directly to the wheel well with an extra set of the bolts that hold the seatbelt "B" pillar hanger in place and several washers under the car in the wheel well, and a nut on the inside. The belt pulls out a bit tight and makes some scraping noise, since it is going up and then out, but it works just fine.
Good luck guys!
Thomas