Here is a patch which converts the original mapper in Double Dragon from MMC1 to MMC3.
Double Dragon (USA).nes - NOINTRO
CRC32: 62AFE166
MD5: 79AA819580967FFB27A9698EFBF493B9
SHA-1: 84698B12F4E56A37C67BB47359758124C9B012BB
SHA-256: E00583F6DB4CF3709416E93C5C9E5CAFE92FBDE9A3A1DA34CD30770C5D20A2D9