I think if you took Aikido to Judo competition (probably the easiest transition) - assuming you trained it for that format, rather than the typical no-resistance approach seen too often in Aikido schools - it would still look a lot like Judo. What would be most different would be the defense, not the offence. As
@Shatteredzen suggested, there's a difference in the way an attack is received. I suspect it would be initially confusing to Judoka, because it is new. How much of an advantage it would be probably depends on how adaptable the individual competitors involved are.