The picture you posted appears to be a couple years newer game after Tiger's Aliens license ran out? The title is Project Alien instead of Operation Aliens. The LCD looks different too (no Xenomorph), but I think it's safe to assume that the ROM is the same.
The Mattel Soccer ROM is basically 2-in-1, there's a hardware setting that selects between Soccer and Hockey. Yes, the goal scoring sound is different (on MAME too), it's a siren sound for the Hockey game, a short jingle for the Soccer game.
The mask ROM identification (or call it a serial) is a 3 letter code, if it's the same, then you're guaranteed that the ROM is the same.
The Basketball game that starts with 15 minutes instead of 12 is not dumped yet, and AFAIK it's not a hardware setting like with Soccer/Hockey.
