IPON

Yes but the throws are used diferently. From the perspective of using throws it would be difficult for any style outside of Judo to be competive. There are a lot of styles that use throws but very few that have mastered throws as judoka.

The larger question is why would you want to compete in a judo competion. BJJ , sambo san shou etc I could understand, but not HKD

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A person who is said to be proficient in the arts is like a fool. Because of his foolishness in concerning himself with just one thing, he thinks of nothing else and thus becomes proficient. - Hagarkure