Minimal rating difference. You aren't tracking the car. You're unlikely to be loading the axle that heavily.
That said... Old PSS tires really, really, really suck. I wouldn't do it for that reason.
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2011 M3
2006 Sierra 2500HD 4WD LBZ/Allison
2004 X5 3.0i 6MT
1995 M3 S50B32
1990 325is
1989 M3 S54B32
Hers:
1989 325iX
1996 911 Turbo
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