From GameWatcher: “Apex Legends hitboxes have recently been contested, with the players quickly coming to a realisation that they’re not equalised among characters at all. Instead, each has their own special hitbox that’s unique to their posture and stature. Down below, you’re going to find some useful info on how they compare.”
Source: N4G PC Apex Legends Hitboxes – Are there any Differences in Character Hitboxes?