Eggs generally begin development after the whole of the egg has reached the correct temp for hatching. When heat is applied from the outer surface then the bigger the egg the longer it will take for the core temperature to rise. You could put them in biggest first , but if they are to be kept together afterwards the larger chicks may trample the smaller ones
If they are your own eggs and the hatchlings have plenty of space to get out each other's way and ample feed an d water stations it might be worth a go