Is that the 375-3030 card? If so it should work, according to the Sun System Handbook (which is reachable through sunsolve.sun.com) it should support:
QLogic QLA2212F/66-SUN
3.3/5V32/64Bit33/66MHz
RoHS:YL
In theory it should be able to push more data in a 66 MHz slot compared with a 33 MHz slot, but it all depends on your datatype and how much it can push.
.7/M.