Toho, the Japanese film studio that created Godzilla in 1954, acquired the rights to the Kong vs. Godzilla concept from American producer John Beck, who bought original King Kong stop-motion animator Willis O’Brien’s pitch for a King Kong vs. Frankenstein crossover.
But by the time I was in middle school — long before I had ever watched King Kong vs Godzilla (or the original Godzilla and King Kong, for that matter) — I knew the story about the film’s multiple endings.
Even if there aren’t two different outcomes to the final fight, there are two different cuts of King Kong vs. Godzilla.
Beck turned around and sold the idea to Toho, who then used that premise as the basis for King Kong vs. Godzilla.