It seems to me that if you need to risk the potential consequences of housing them together, you may not be ready to get another snake just yet. I like to think each snake one has should have the proper space and husbandry before another is considered. It's not really fair to the animals.
This may not be the case, but it looks like it to me.
Also, if this pairing could result in offspring, you would need more room for an incubator and setups once they hatch.