To be fair, the author of this fiction never say 鸠摩智
is 鸠摩罗识.
Just that their name, religion and nationality is very similar,
that's all.
Anyway, 鸠摩智 has later on back on the spiritual path
again, so even if 金庸 refer them to the same
person, it doesn't matter.
I'm okay if 金庸 actually refering to the same person. But then I
hope buddhists won't take fiction as fact to tell people that he
used to attached to martial arts, etc then eventually back to
spiritual path.
If it happened that 鸠摩智 and 鸠摩罗识
to be the same person, then we are doing a disservice in not
knowing the facts correctly.
Regards.