I'm gonna put my two cents in as a hearty "NO!" Too many reasons why NOT to. Hardly any good reason at all to cage those two animals together. First, you don't know the gender...Very good chance that this alone is going to cause problems or stress to one or both. These two snakes will not remain compatible in size for very long AT ALL. The yellow rat will outgrow the corn.
Health is a potential issue, as one of the posters in the general forum pointed out. Unless you are POSITIVE that BOTH snakes are perfectly healthy, you run the risk of spreading anything that one may have to the other. If cost is an issue, I would suggest an inexpensive rubbermaid or sterilite container.
Oh...How big IS the cage? Unless it's pretty big, you will want another cage soon anyway...So just get it now. Do you have both snakes right now? How are they being kept. Etc. Do yourself a favor, and get two cages. Good luck. Duffy