Which one?
The 9mm Parabellum is longer than the .380 ACP (also called the 9mm Short) They do not interchange.
probably If the pistol is designed for 9mm Luger, 9mm Para, or 9x19, yes.
Loaded or unloaded?
The 9mm pistol would have the higher decibel rating.
50-75
50-100 or so
$100-125
100 USD.
No
Most likely a 9mm with a suppressor
9mm MKV is not the same as 9mm Luger.