There were more than 60k casualties in WW1 for Australia.

http://www.awm.gov.au/search/all/?query=first+world+war+casualties&op=Search&section%5B%5D=articles

That comes to 216k casualties. Casualties is more than just the dead. That's why the casualty ward of a hospital isn't the morgue.

The AWM lists almost 40k killed in WW2.

http://www.awm.gov.au/node/6696/?query=66%2C553

I'm trying to find the other casualty figures for WW2 for Australia. Off the top of my head it was about 66k wounded. If I can find that I'll edit this to include it.

Edit - Changed the link to one which lists killed and wounded. About 66k wounded for Australia in WW2. With killed and wounded the casualties are 106k.

All up though, yes, the casualties in WW1 for Australia will be higher than that of WW2.

One of the reasons, at least looking from the perspective of the Second World War, is that in the Second World War Australia spent much of the time fighting in areas such as North Africa, where there was less fighting than on the Western Front of the First World War, for example, and also in the Pacific, where, according to a number of Australian historians, such as Peter Brune, the Australians were not used as much as they could be by the US General MacArthur who was the Supreme Commander in the areas Australia mostly found itself fighting in the Pacific. As US forces moved further and further north the Australian forces were used in mopping up campaigns, for instance, which had less intensive fighting. Much of the areas that Australia found itself in in the Pacific were covered in jungles which also decreased how many troops you could throw into one area on both sides.

Generally ww1 battle casualties were higher due to the nature of postional attrition warfare that was prevalent at the time. WW2 battles didnt result in the high body count compared to WW1 because maneuver warfare that was used in the west meant that maneuvering mechanized formations caused the enemy to withdraw to a more favourable position instead of digging a permanent defensive position and fighting it out in trenches. WW2 was the first time that civillian casualties were higher than combat casualties thanks to arial bombardment and the total war nature of the eastern european front and everywhere the japanese fought.

Because during the battle of Gallipoli the Australians fought against the Turks who had the Australians pinned down on the beach with machine gun fire for a very long time with a very steep incline on the beach which quickly turned into trench warfare on a hill which didn't go we'll for the ANZACS