I tend to go with what Droid says, that Doallyn is the one that gets knocked down by Chewie and these two characters are definitely not the same. I think wookieepedia is messed up or the folks at decipher.
Sgt. Doallyn in the movie has the same helmet as on the wookieepedia site, however, he has the outfit of Bane Malar and his helmet is shiny, unlike his pic, which shows him in a white overall/jumpsuit type outfit??