A few, though IG has sheer numbers on their side, roughly balancing it out. Like, if Thernus were ISOT'd into canon 40K, your regiments would perform much better than theirs on a person by person basis, but their regiments tend to be 5000 soldiers, as opposed to the 2500 you use, so two Regiments, one from each side, would most likely annihilate each other. In addition, they tend to have more Hero Units within easy reach, who would help swing things back in 40K's favor, and tend to field more regiments than you, as the 40K Imperium cares a lot less about human lives than The Bastion does, and is a low more willing to mass conscript to drum up crusade soldiers.