I do not know what that sentence is supposed to mean, but the so-called "mapper 2 hacks" of "Highway Star" in GoodNES are not dumps from any cartridge, so any PCB image you may have found cannot be a PCB of said "mapper 2 hacks".goodnes Highway Star (J) [hM02] ,You seem to have posted PCB on the wiki.
GoodNES' "Highway Star (J) [hM02]", PRG-ROM CRC32 0x24A0AA1A, is an iNES conversion of the Front Fareast Magic Card diskette catalogue number F2037.
GoodNES' "Highway Star (J) [hM02][p1]", PRG-ROM CRC32 0x0446282F, is an iNES conversion of the Bung Game Doctor diskette catalogue number G062.
I have both original disk images myself.
You can tell that both are hacks for Game Doctor/Magic Card types of RAM cartridges from their write to $42FF, which is the Game Doctor's Mode/Mirroring register.