A146: No, it doesn't. The recommended procedure to play other races is to treat the creatures CR as a character of the same level. So an ogre without any levels would be a 3rd level character and an ogre with one level in a class would be a 4th level character. But since some abilities are a lot more or less useful in the hands of player characters, GMs should check if the level of the creature should be a bit higher or lower than the CR to make it comparable to the other characters in the group.