This order from Hon’ble Bombay High Court talks about adjusting the maintenance paid under one case, when a maintenance order is granted in another case/law/act.

Intention of the judge, from Para 18,

What I intend to emphasize is the fact that the adjustment is permissible and the adjustment can be allowed of the lower amount against the higher amount. Though the wife can simultaneously claim maintenance under the different enactments, it does not in any way mean that the husband can be made liable to pay the maintenance awarded in each of the said proceedings.