Suntour's groupsets were a bit notorious for being incompatible between each other and this extended to there being specfic chains for different transmissions.
What speed is your XT rear mech for? If it's an 8 or 9 the chain may well not fit through the cage properly. The front mech doesn't matter.
I'd say do yourself a favour and get a good chain - either a modern top end Shimano or a Sachs / Sedis / Roholoff. Suntour were never lauded for the quality of their chains.
Raleigh Ozark (1987)
M-Trax Ti-1000 (1995)
Dynatech Roadie (1996)