How different are these controllers and can they be swapped out in the field?
There are differences between the 2 controllers and there are considerations when swapping them out
The CX9400 has 4 MG of memory
The CX9410 has 8 MG of memory.
The co-processors of the controllers are also different, so it was never possible to just add memory in the field, they had to be shipped to repair to add the memory and change the co-processor.
The units can be swapped out, but considerations are related to memory. If the functions that are being used are more memory intensive then swapping from the 9400 to the 9410 could cause latency issues or other performance problems.