For PLAN, YJ-63 is a little bit too bulky for warship and coastal-defense platforms. So YJ-63 was redesigned into the leaner YJ-62, which was used by land-based units:
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As well as on 052C destroyers:
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More recently, the navy may have replaced all YJ-63s with YJ-62s ("backward" upgrade) for its H-6 fleets.
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So the following is more accurate, thanks to Deino's question:
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H-6J uses faster YJ-12s for the first-wave attack and slower YJ-62s for the second-wave attack.
But so far wwe s haven't seen a YJ-62 on any aircraft. AFAIK there is not even an airlaunched variant.
And by the way the YJ-62 is not a smaller variant of the -63.