It is not really different. It is situational.
If you are talking about providing an enclosure large enough with adequate resource, housing more than one snake can be just fine. If you are talking about cramming two snakes in a 20 gallon aquarium because you do not want to spend money on another enclosure.....you do not need to even own one snake. It depends on the situation and the keeper....so to say that you should NEVER keep two snakes together or that it is ALWAY for the keeper's own interests is getting a bit carried away.
In response to the other comment. I see reptiles side by side all the time in the wild. They may not be right on top of each other, but they share the same environment. When they have room to find their own space and do not have to compete over resources....everything is usually just fine.
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