I wanted to play these games with my brother and they're on sale. I heard these were the DOS versions and not the arcade.

please?

I don't have so I couldn't tell how the actual experience is

From the game page: https://www.gog.com/game/mortal_kombat_123

NOTE: Mortal Kombat 1 + 2 feature only hot-seat multiplayer while Mortal Kombat 3 features multiplayer through a LAN connection.

Please be advised that Windows 10 operating system will receive frequent hardware driver and software updates following its release; this may affect game compatibility

Despite the fact that you already asked this in the game's forum, I'll answer here: Yes, they all have local multiplayer. Default controls stink and I'd recommend Joy2Key or XPadder (if you have it).