The difference between diesel and gasoline as fuels is significant. Diesel fuel is "combustible", whereas gasoline (petrol) is flammable. There are lots of precautions for storing gasoline and for starting gasoline engines, particularly in boats. Because gasoline vaporizes and can explode, even a stray spark can ignite gasoline vapors in an enclosed space. So yes, for gasoline there are more rules and precautions.
Diesel does not ignite with a spark, does not readily vaporize, and thus has fewer restrictions and precautions than gasoline. And it is also the reason that it is the preferred fuel for boats.
Do a search for "combustible vs. flammable fuels" and you will get plenty of information about this. Here's one link: http://www.martinoilco.com/safety_training.pdf