No, they actually are not.
The guy you hate, Byron Bell, posted a -2.8 rating from PFF in 2014.
Marshall Newhouse, on the other hand, posted a -9.7.
In other words, he was 3x worse than Byron Bell.
Byron has an overall -6.6 (-2.8 PB and -4.1 RB) in 84 snaps while giving up 2 sacks, 1 hit and 3 hurries
Newhouse has an overall -0.2 (-1.6 PB and 1.1 RB) in 105 snaps while only giving up 3 hurries
Granted he's going up against 2nd string, i'm just pointing out you have your PFF grades completely wrong