I like to think that Super Carriers are basically 2-3 heavy macs flanked by Archer Missle bays and Hangars with some minor space for the crew, pilots, and engines. Aside from that, 3-4 meter thick armor with AAA batteries for defense. Though, that's how I compare them anyways.
SMACs are too large to mounted on starships. Their power requirements are too great. However, it more than likely carries at least one heavy MAC. It is entirely possible that carriers do not field MAC guns, focusing instead on fighter and missile compliment. You don't see Nimitz-class aircraft carriers with 16-inch gun mounts, do you?
but it is stated that unsc super carriers are the only ship that can effectively engage covie ships so you never know and super carriers, by definition, are large vessels. the heavy mac comment is pointless, lore says there is only two types of ship based macs, normal macs(600 tons) and super macs(3000 tons)