Sometimes, when you create hundreds upon hundreds of characters for your works of fiction, you run out of names for them and start recycling a name or two...
I don't know if there are any notable incidences of Jin Yong doing this, but I think Gu Long did it at least once: recycle the name of one character for another, completely unrelated character in a different novel. In SENTIMENTAL SWORDSMAN, RUTHLESS SWORD, there's a somewhat significant character (one of Lung Siu Wan's guests and seemingly the ringleader in the effort to frame Lee Chum Foon as the Plum Blossom Bandit) named Chiu Jing Ngor. He was probably the more well-known Chiu Jing Ngor in Gu Long's canon, but he wasn't the only one. In LUK SIU FUNG: BEFORE AND AFTER THE DUEL, Luk Siu Fung asked a Beijing beggar to help him investigate the mysterious white horse that came out from the stables of the Forbidden City bearing the corpse of Cheung Ying Fung, and that beggar's name was...yep, Chiu Jing Ngor (no relation whatsoever to the identically named SSRS guy).
Are there any other notable incidences of wuxia writers completely recycling a character name for two unrelated characters in different stories?