Yes, chances are about 33% that a pair will work. You can try it as long as you have a way to separate them if need.
BTW I had 5 baby black aros together and they fought, eventually killing one. Now they are separated into pairs. One pair seems to co exist with very little fighting, the other pair I had to separate with a divider. When trying to build arowana communities you just need to be ready for just about anything.