is it possible to copy current-active image to next-active image?

after my misadventures upgrading some n1548p switches to firmware 6.6.3.12 i have some switches where i have diownloaded the 6.6.3.12 firmware, but not yet reloaded the switch, so the switch is still running 6.5.3.3. but the backup firmware is a different version entirely. so i am thinking i would like to copy current-active, to next-active. is that possible?

unit active      backup      current-active next-active
---- ----------- ----------- -------------- --------------
1    6.6.3.12    6.3.2.4     6.5.3.3        6.6.3.12

of course i can just re-download the 6.5.3.3 firmware and that will become the next-active image, but it would just save time and hassle to not have to download the 6.5.3.3 image via tftp.