The difference is the amount of powder
its the same caliber bullet
but different amounts of powder

you can buy a book to look up the kind of powder and the amount of grains in it

Bullets come with different kinds of powder that have more or less "kick" to the amount

so if you buy a book and its the same power level with the amount of powder
you could do both
but if i was you
id stay with the bullet it says
or you could end up blowing up your gun with your face to it with a very small mistake