JRSully;
I am fairly certain the the wheel is the same as long as it is date coded late 69 or early 70. Any other year and all bets are off. Actually for a Nova the range of years might be wider.
GM reused codes over the years so XT from 70 might be a steel wheel. XT in 78 might be a aluminium wheel.
This might help
PONTIAC WHEEL APPLICATIONS