My only problem here is that, in Colorado, there is no such thing as a "Transaction Broker" contract. That being said, the agent you first saw the first home with could have a claim for the commission on the sale, as the "Procuring Cause" for the sale.
If you signed a specific "Buyer Agency Agreement" with a different agent for specific properties, you need to review what the specifics of this agreement entail. Again, we don't know what this contract states, so it would be tough to help advise you here.
If I were in your shoes, I would talk to both agents and be honest with them both. I would ask them both to see if there's a way to work things out so that you can achieve your goals of buying your next home. If one is willing to waive his/her claim on the commission, or if they're both willing to work out the commission between themselves, I would make sure you get the information in writing. Who knows, the agents might be best of friends, and might be happy to work it out.
Remember, Realtors have an ethical obligation to work in their clients' best interest. I wish you the best of luck with this!