Good question, Deino.
In the original post, the air intake on YJ-63(XL) for training is not visible, making it look like its predecessor YJ-6. Yes, the older rocket-powered YJ-6 has been retired a long time ago.
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YJ-6 is heavy with rocket motor and fuel. The first missile-carrier variant H-6D could only carry 2.
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By the way, YJ-6 was exported to Iraq as C-601 with H-6D (four in total) in the 1980's, which damaged/sunk several supertankers during the Iran-Iraq war.
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YJ-63 is a newer turbojet-powered missile. Longer in range (>200KM) than its predecessor, YJ-63 is actually lighter. It was originally developed for the navy as an anti-ship missile with radar. PLAA likes its heavy warhead for land attack and had it converted into TV-guided KD-63. Here is the training version of it (K/AKD-63):
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KD-63 is still in service and often seen on H-6K:
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and H-6N:
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(to be continued due to the limit in the number of images)