Here is a patch which converts the Mapper in Goonies II from UNROM to MMC3.
Goonies II, The (USA).nes - NOINTRO
CRC32: AA9CA482
MD5: D38325CFFB9BA2E6F57897C0E9564CC0
SHA-1: 0A5B8FD5E46F56203F8BF12E888F4F2EA1616AA8
SHA-256: B0111C5CDECDE685C3589B43564F01EB378EDA934648079A37A703195BEC2CA5