Huh? This is very much not my understanding of SMB1’s development. Are you maybe thinking of Donkey Kong (made to replace a failed arcade game) and/or the US version of SMB2 (a re-skinned non-Mario Japanese game)?
https://grantland.com/features/the-rise-of-nintendo-video-ga...
https://iwataasks.nintendo.com/interviews/wii/mario25th/4/0/
https://www.reddit.com/r/AskHistorians/comments/2w1zl4/when_...