I mistakenly restored my 4.3.2 iPod touch but know it is 4.3.5, how can I change it back?

The only way that I know of is that you have to already had your device jailbroken with saved hash tags. Might have to put your device in dfu mode and also block apple servers during the restore process. That is the only way to restore to a previous firmware. Other than that you are stuck at 4.3.5.