If you use the OEM 90 slave cylinder, the 91 & up replacement line should fit. You may have to re-bend some of the pre-made bends....I'm not sure, sorry.
I know that when I changed out my 90 OEM slave for the replacement 91 & up slave, my 90 OEM line would not quite make the right bends down at the newer slave. I was lazy and had the newer line but was in a hurry & didn't put it in at the same time. I had to re-bend the last little bit of the old line to get it to fit.
Judging from my foray I would guess that we should do the 91 & up line + 91 & up slave cyls together?

Tom