Here is a patch which converts the original mapper in Mario & Yoshi from MMC1 to MMC3.
Mario & Yoshi (Europe).nes - NOINTRO
CRC32: 0E5F9BA7
MD5: FD4961CB3E96C3B6A058FE8FEAD46990
SHA-1: 9CA35258A3637B43C45EF7F17A75C7B32EA969A8
SHA-256: A82EBB3CBD0F10B36DAF9F3C2FAD7BD9F316A7213992DB3E482BF15892B26589