88-91 vs. 92-95 Hydraulic Clutch question

[5speed91]

Hello all, I'm in the home stretch of finishing up a L31 vortec TBI engine swap and installing a freshly built 5LM60/NV3500 trans. The original GM hydraulic clutch line is still working but looking pretty terrible. I wanted to replace the whole system to go with my new clutch but the LMC prefilled system says it only works on 92-95 models. My truck is a 1991. What is the difference and can the 1992-1995 system be installed in the 1991 provided I use the matched master, line and slave?