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It's just Spartan and standart chess, played with bughouse rules.
But these 2 variants would be interesting:
1) One one board both players have armies A (standart, for example) and on other board both players have armies B (Spartan, for example);
2) 2 Armies on same board are unequal, on second board armies are same, but teammate have different army.
Any unequal armies game, played according to one of these rules, will be balanced :).