Here is a patch which converts the original Mapper in Super Pitfall from UNROM to MMC3.
Super Pitfall (USA).nes - NOINTRO
CRC32: A4958020
MD5: CC9FA49D1C3756A7A9533B8F040E0C4C
SHA-1: 2373E952FECC5F7507F99476E82C298CAB1F51CB
SHA-256: 8FBC2386A991D96F6914DEC78F1253AFA3F3C6E9865A6B28A498CC7301AAF8F1