using CNUT to update SM's with the same firmware.

This is probably a rather simple question but I wanted to clarify. We typically use CNUT to update our PMP 450's to new firmware version. We are now attempting to update some strays that were missed in, or added after, the last update. Rather than doing it manually I was wanting to use CNUT to find them, but i was wondering if i need to manually select them in CNUT as to avoid reupdating an already updated AP or SM or will CNUT automatically skip AP's and SM's already on the same firmware?

Yes, the same version radios will be skipped. I do this almost weekly and it works fine.