It all comes down to the license you hold. The conditions are imposed on the license and are not location based. An ACT L's (or P's) license says you may do the speed limit, your car must not seat more than 12 and must weigh less than 4.5 tones (GVM) and bikes dont count. as long as you meet those requirements you are still legal. Same applies for motorbikes, in the act you are limited to >=150km/Tone, where as Vic you are 250cc, 9/10 times a 250cc will be less than 150kw/Tone, the exception is 250 two stokes. But that being said an ACT rider can ride almost any Harley except the V-Rod because of the weight.
Honestly i think its all a load of c**p but i dont make the rules.