Does Chutney want to get out because they're fighting or he's being bullied, or you think he wants to get out because he enjoys human contact more??
Are they both living in the Gabber together at the moment? That's plenty of room for two Campbell's together.
Unless Chutney or Mango are beoing obviously bullied by the other one, or blood has been drawn, I'd keep them together. Campbell's can have very different personalities and it sounds like you're finding that out. Chutney obviously loves human contact and playing out whereas Mango likes to just be left in peace and do his own thing. There's nothing wrong with that.
Some of my Campbell's are very extrovert and love attention whereas I have a few who just want you to provide food and water and then clear off and leave them to get on with it alone, thank you very much. That's just how they are. I have to go poking round one of my Gabbers every morning and night to check my Campbell George is okay as he very rarely gets caught coming out when I'm up. He just gives me this look of "oh its you, now what do you want? I'm having a nap". He'll suffer through a cuddle but he really just wants to go back to his nest with a nice snack.