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"All the switches in the switch stack need to be running the same license level as the active switch."
I believe that's not actually a hard requirement on StackWise models, but it does avoid some issues.
"All switches in the switch stack need to be running compatible software versions."
I believe what actually needs to be compatible is the StackWise software versions, but running the same IOS version is recommended (as it also insures the StackWise software is compatible).
BTW, depending how you stack your two units, one unit will lose its current configuration, as in a stack configuration, there's just one configuration for all your switches. If this is a concern, you'll want to save switch configurations before they are joined, so you can reapply (similar - port numbering may change) or you can preconfigure ports for the switch to be added to stack.
