The only one I can guess at is the "NT9915" one, which was possibly made by
NT (Ka Sheng). No idea about the other two.
Doraemon 4 probably is official given that it's in Japanese, most pirate originals are in either Chinese or English, but I don't know of any Doraemon game with that title... does it actually say "4" on the title screen? According to Wikipedia, the official games are:
Game Boy
Doraemon 2
Doraemon Kart (Game Boy)
Game Boy Color
Doraemon 2
Doraemon Kart 2
Doraemon Kimito Pet no Monogatari
Doraemon Memories: Nobi Dai no Omoi Izaru Daibouken
Doraemon no GameBoy de Asobouyo DX10
Doraemon no Quiz Boy
Doraemon no Quiz Boy 2
Doraemon no Study Boy: Gakushuu Kanji Game
Doraemon no Study Boy: Kanji Yomikaki Master
Doraemon no Study Boy: Kuku Game
Doraemon: Aruke Aruke Labyrinth
So it's likely one of those, I guess.