Godofwartordle

I have a 98 ex coupe when I purchased the car it had racing bucket seats with 4 point harnesses for both driver and passenger side. I replaced the seats with 03 civic coupe seats front and rear. The problem I have is the previous owner removed stock belts assemblies. I went to a salvage yard today to buy a black belts out of a 2000 si. The guy at the yard told me that not all seat belts from 96-00 are interchangeable. So does anyone know if they are interchangeable?