if they are same its possible. you should connect one end of each outputs together and measure the voltage at two remaining ends. if the measured voltage (AC voltage) is near to 0V, you can connect two remaining ends together also. and if the measured voltage is about twice the output voltage, then you should swap first connections.
in general, when one end of each outputs connected to each other, the AC voltage between remaining ends should be about 0V. at this situation you can safely connect remaining ends.
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