The target commonly discussed for redirecting is Amir'ka and it has 455 worlds, given usual ratios there's probably a dozen or maybe even two dozen daemon worlds there. In terms of being capable of beating them, pre-awakening yes. But post awakening basic orcs have an advantage over chaos guardsmen. Plus Chaos can't transport billions of troops as easily as the orks. I could easily see the orks taking a big chunk out of Amir'ka before their navy was ground down, and that would include daemon worlds.
Chaos fleets are something of a bad match against orks as well. Chaos fleets strongest combatants tend to be daemon battleships and battle barges with incredibly high armor ratings. Strikecraft use a different formula for armor calculation that effectively gives them massive armor penetration. Orks use truly absurd swarms of strikecraft that would chew up daemon battleships in short order. This is made worse by Chaos ships mounting less AA than our own, and AA directly divides strikecraft damage. So even though the Chaos fleet is larger, its advantage is probably less than it appears.
Any of the smaller chaos powers would definitely get wrecked easily.