Yes, Gov JBC and his surgeon, Dr. Shaw, both said they believed JBC had been hit by a separate shot from the one that struck JFK.
How on earth JBC received an entry wound on the dorsal side on his wrist, after the slug had first traveled through JBC's chest, is another inexplicable mystery of the JFKA. And the slug then made a neat small round hole in JBC's left pant leg and burrowed into his thigh. But the bullet is found later outside the trauma surgery room. Maybe.
The JFKA LNT remains implausible, which is why the second official investigation, HSCA-1979, concluded there likely had been a shot at the GK and a JFKAC.
Caveat emptor, and draw your own conclusions.