Not if they are put side by size, you will see the HK53 is
slightly larger a little than the MP5 . In fact it is very hard to
spot the different, the easiler is to look at the magzine, which
the 5.56mm is much wider than the 9mm.
The Hk53 offer more firepower and range, which make it a rifle
while the MP5 is a submachine gun.