Could two Jamps be housed together? When you say newer keepers do you mean new to reptiles or new to retics? I have kept reptiles for about 10 years and have had Burms,Boas and the list goes on and on. As far as Retics these would be my first ones.
No, I wouldn't house any two retics together permanently - and a 6' cage still isn't enough room for two Jamp adults IMO. If you're new to cohabiting animals and have no experience with retics I'd stay away from keeping two together and get two separate enclosures.