Considering that Australia made their own licence produced 105 mm rounds, I think it matters.
“not matters much” as in its not necessarily incorrect/incompatible, just not used in service (i imagine).
The equipment is technically capable of firing pretty much any 105mm type, but Australia seems to have used L52A2 APDS, L35A2 HESH, M456A1 HEAT, M416 WP, M494E3 APERS, and some TC800 Canister, along with the usual matching practice rounds.
Yea, it’s technically correct, since NATO 105 mm ammunition will fit any 105 mm gun based on the L7, which covers the vast majority of 105 mm guns used by different nations. Still, it’s a shame Gaijin doesn’t really model more of the ammunition types developed by individual countries, like the L64A4, MECAR rounds and many more. I’m still waiting for the Leopard 1A5BE to get its armor piercing MECAR ammunition.