I'd actually say that early on, they are fairly comparable. Only as the levels get higher, do they really become vastly differently. The big difference early on is the damage and the bonus hit points
For instance, the PF Ogre has 4 HD, AC17, and does 2d8+7 damage
The S&W Ogre has 4 HD, AC14 (should really be 15), and does 1d10+1
OTOH, you have the Otyugh, which is very similar
in PF, it's 6 HD, AC17, and does 1d8+4/1d6+2/1d6+2
in S&W, it's 6 HD, AC16 (really 17), and does 1d8/1d8/2-5
But at tenth level, things get way out of whack.