Either of the two ROM versions found in the 9600s will work in the 9500. However, there's no apparent advantage to the .34F1 code. The .34F5 (from the "Enhanced" or Kansas machines) has a speculative processing fix which will let you enable that feature on G3 upgrades without danger of problems.
But, the Kansas ROM will prevent you from running systems earlier than 7.6.1 on the machine.