I`m not sure about the names of the gases but the blue bottle doesn`t like frost and will freeze at about -1 degree, where as the red will not freeze until -20 something or lower? you will need a new regulator/pipe depending whats on your van to change, but your appliances in the van will be fine, purists will tell you that one burns hotter than the other, but in reality it doesn`t make any noticable difference, Happy vanning I hope you have some great times.
TONY A.
PS if your going to Europe, they don`t sell calor, you`ll be better with camping gaz.its available in most supermarkets in France. (yet another regulator)