(But seriously, I don't know which studio owns what, but if both films are the property of one studio, then I suppose a crossover between "Snakes" and a certain previously popular snake cheese would be likelier... "Anacondas on the Planes"...)
By the way, I see that a certain, er, "studio" known for releasing terrible video "films" with titles similar to currently popular films in USA has already done "Snakes on a... Train". I wonder how long before there is a porn title reference to it. Let me guess... "Snake in the Pants"...