Why do you keep babbling nonsense about just _two_ CO2 molecules? There are kajillions (to use the technical term) of CO2 molecules around in the atmosphere. What's the point of limiting your physics ignorance to just two molecules?
Sure, if you have just two molecules, it's extremely unlikely that one will radiate into the other. However, since you'll never see just two molecules, that doesn't matter. It's a deflection and red herring on your part.
Also, an individual molecule of CO2 doesn't have a temperature. An individual molecule of anything doesn't have a temperature. Temperature is a statistical quality of a very large number of molecules. That's physics, and you fail hard at it.