if u burn some1 b4 they hav a chance 2 become a zombie can they become a zombie?

this has been puzzling me 4 a while now, when some1 dies and u bury them when they become a zombie they just dig themselves out, but what if u burn some1 b4 they have a chance 2 become a zombie? then would they just become a zombie made of ash? but then they wouldnt b able to eat us right? then they would just "decay to death", like they decay so much they just disappear from existance enitrely? does what im saying even make any sense, cause right now im just confusing myself! hope i didnt confuse u oder anything!