Kakashi in part 1 did say sauske had potential I believe but he also said Naruto's charka capacity is larger than sasuke's, it was one of the first glimpses that made naruto look kind of special
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However this statement contradicts anything in part 1 said about chakra reserves because now knowing kakashi's reserves are average he said naruto's are most likely above sasukes and
even above his own. The wording of that would make you assume sasuke's are less than kakashi's but they are very obviously much greater.
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And idk which translation is more accurate this one came from Narutobase and here it only says their reserves are incomparable in comparison to sakura's which honestly doesnt mean much