This has been common knowledge for a while, but I decided to put it in video form.
Voice Comparison of Franklin Delano Donut’s voice in “S.O.S.”, episode 6, of Red vs. Blue: Season 11
In the original (web-airing) of episode 6, Donut appears to be voiced by another actor, as opposed to his official voice actor, Dan Godwin. Dan Godwin re-recorded Donut’s lines for the DVD version of this episode. While not confirmed by any sources (that I could find), the voice in the original airing is believed to be that of the director and writer of Season 11, Miles Luna.