Most of the time you need the same make to be sure. What make does your mate have?
I have a Scala Rider Q1 and it says it "may" work with some others, but I haven't tried it so can't confirm.
Do you want to spend 100 notes on 2 headsets so you can talk to each other (unlikely for a decent make), or simply have one for music/sat nav/phone etc and the intercom just a 'nice to have'?
I find the Scala is a great headset and it's been battered for years of touring with no issues. A mate has a Sena and say's that's pretty good too.
An alternative if you only want to have the odd conversation is to set each others mobile numbers up as your hotdial number, then you simply call each other with an easy button press. The phone quality on the Scala and Sena is like you're in a quiet room, amazing how they cancel the noise of the wind.