The story presented here isn't the Monty Hall problem, nor is it the Three Prisoner Problem. The answer remains, it doesn't matter if he switches or not.
Moe, Larry and Curly are in boxes A, B, or C. The king pardons the person in either box A, B or C.
Case 1: Moe, Larry and Curly in A, B, C. King pardons A, Moe lives.
Case 2: Moe, Larry and Curly in A, B, C. King pardons B, Larry lives.
Case 3: Moe, Larry and Curly in A, B, C. King pardons C, but this cannot happen.
Case 4: Larry, Moe and Curly in A, B, C. King pardons A, Larry lives.
Case 5: Larry, Moe and Curly in A, B, C. King pardons B, Moe lives.
Case 6: Larry, Moe and Curly in A, B, C. King pardons C, but this cannot happen.
There are two ways for Larry to live, and two ways for Moe to live.