No, they shouldn't. It's a bad idea all around, much too risky for anyone to take. Some people will tell you they've housed them together successfully for years, but I guarantee you that those beardies will not be as healthy or happy as beardies who live separated.
Too often have I read stories of people coming home to beardies who've lived together peacefully for years, only to find one dead or dying without warning. It's just not worth the risk.