In a tournament setting people's positions on 'counts as' can varry, and its something you'll have to reach out and ask the TO about yourself.
I'm personally less a fan of 'counts as' and more a fan of 'converted from', Chaos has a long proud history of taking bits from disperate sources and making hero units out of them, and while the exalted heroes (assuming you mean those when you say exalted champions) are Finecast, a swapped limb here, a modified weapon there, a replaced head, can all go a long way making them look more like chaos lords in their own right.
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