The Kalishnakov Assault Rifle, also known as the AK-74, uses a 5.45 mm round. Unless my standard to metric conversion factors are wrong, a 40 mm is equal to 1.575 inches, which is HUGE. The main weapon on an A-10 Warthog is a 30mm gatlin gun, just for a bit of perspective.
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Oh, dude, you're hitting me with some math here. So, the circumference of a circle is calculated by multiplying the diameter by pi (π). Since the diameter of a circle is twice the radius, and you've given me the radius (40 mm), I can tell you that the circumference of a 40 mm circle would be approximately 251.2 mm. It's like math, but with a side of sarcasm.
40 decimetres = 4,000 millimetres
4 mm is 1/10 of 4 cm.
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Short answer, a 9mm is smaller in diameter and lighter.