Clearing NVRAM with switch 6 does not erase the array. You can always pop the drives loose while doing this if you want.
The RAID information is stored on each disk in the array, a couple of things to keep in mind if you move the drives to a new server
On the older servers you need to place the drives in the same drive bay. I can't recall what model revision where the controllers will recognise the drive has moved position and adjust accordingly
It is a good idea to update the firmware on the replacement system to at least match the system it is replacing. If the defective unit has newer array controller firmware, the rplacement system may not see the drives.
The only thing you need to move to the new system are the drives