Hi Kezziah, it can be a juggle to fit two cags in when your used to having just the one larger cage. You definately done the right thing by splitting both lads up, so that`s the first move.
I agree with the others about puting them both in a single cage each, even if one has to live in the bedroom and one in the livingroom!
If your going away over Christmas? It would be wise to get another Duna or Savic Rody or similar type cage cheaply and either sell the larger cage or give it to the new owner if one comes forward to rehome one of your boys. Just be mindful that it would be a good idea to let one go to someone who actually keeps hamsters already, or someone like myself who adores chinese hamsters!
Not everyone knows a lot about chinese hamsters and they need a sugar free diet, which not many people know about.
Where are you located incase someone is interested in taking one of your hamsters? Although you would need to submit a seperate rehoming form in the correct section if you were to start a post about rehoming. But saying where you are located helps.