Hi there yeska89, and welcome to the forums.
How old are your B&G, how long have you had them, and who did you have first (male or female)?
Macaw are pair bonded birds, so if you have indeed a male and a female, they may instantly 'hit it off' with each other, or they may not. Their body language will be a pretty good indicator what they think of one another.
I'd introduce them on 'neutral' ground, meaning neither in her nor in his cage, but possibly a (HUGE) playstand that is big enough where they can get away from each other if they wanted to.
Yes, 2 male big macs can get along just perfectly - mine certainly do. I had my B&G first, and when he was 3 I added an 18-month old male GW to my flock. My B&G was initially petrified of the GW, but they quickly became good friends.

They are not caged together, they are, however, allowed to spend a lot of time with each other on my 2 big, combined Java trees.
Here is another thread where someone is introducing a second big mac:
http://www.parrotforums.com/macaws/53401-how-safely-bring-second-bird-into-family.html