UK AIP ENR 2-2-3-1........MATZ Penetration.
Difference=M=Military
Callsign;
(ii) Type of aircraft;
(iii) Position;
(iv) Heading;
(v) Altitude;
(vi) Intentions (eg destination)
ie.
Who you are.
What you are.
Where you are.
Where you're going
They know what you want because you have already requested MATZ Penetration in the wake-up call.
So, not much difference.
OK. So the Military don't want to know where you are from. Something less to worry about remembering. When in Rome......etc