I don't know anything about the old one, but you can use the 2p switch in the 1p's place as long as it's contacts are adequately rated for the NO switch. you will have one NC side to the switch where the input is connected to the output, don't use this one. use the other set....give me a minute, i can draw this.
If you can't get a schematic on the old one and it is not printed on the switch, get a voltmeter and measure the resistance across the terminals to find where the switch is. My guess is that there are multiple connection points to each side of the switch. there aren't any lights or anything else on them are there?