I don't think Bose offer two different impedances. They do offer different connectors: the standard two-jack version (for normal planes) and a single-plug (a plastic Lemo connector) for aircraft-powered installations. I have used both. But the headset and mike are identical.
I would ask the maker of your intercom, if possible.
If I am correct above, and you have the option (ie it's your own plane) I would go for the aircraft powered version. For about £30 you can buy a panel mount socket (e.g. Headset Services, Shoreham) and it saves the need for a battery. The downside is that if you buy an ICOM transceiver with a "headset adaptor" you will need a normal two-jack headset... (one can make an adaptor for that too)
Bose are great headsets, arguably the best there are. But they aren't built to be chucked around in a club environment!
But hang on.... are these aviation headsets or hifi headsets you are talking about???????