A little mathhammering:
11 Boyz and PK Nob (a single trukkload) vs. 10 Warriors, Warriors charging
Both have I2, so everything happens simultaneously. Warriors strike 20 times with average of 10 hits, 5 wounds and 4,17 dead orks.
Orks strike 33 times with average of 16,5 hits, 5,5 wounds and 2,75 dead 'crons. Nob strikes 4 times with average of 2 hits and 1,67 dead 'crons.
Thats not quite a draw, but the difference is so small that in real game with real rolls it might be anything from winning by 1 or 2 to losing by 1 or 2. In any case the Orks won't be Fearless after 3 or 4 casualties and there is a good chance that you get a few of those four or five Warriors you lost back from Reconstruction Protocol rolls.
However, as the orks usually come in open topped boxes and have the option of calling Waaagh! to get Fleet denying them the charge pretty much means you have to shoot them out from those boxes and, preferably, be in Ghost Ark yourself.