The union links to the NDP could see it performing not dissimilarly to Labor in a fair number of seats, I suspect.
So there has to be either a permanent coalition like IRL's Lib/Nat one or a merged LDP. Which would be extremely difficult, if not downright impossible given the ideological/cultural disparity. The NDP, even today, will never assent to an economic program like HK Lab's or anything remotely similar. Liberals would have to work with the Tories.
Perhaps like BC? NDP vs BC Liberals? Be interesting to see the development of the NDP in this scenario - it started out as an agrarian socialist party, CCF, didn't? If that's the case, perhaps the Liberals would have had the greater links to the urban unionised workforce?
The other way to approach it is if we look at ridings and have a bit of a guess at their foreign equivalent (either look at a Canadian riding and work out what Australian electorate it resembles, or look at an Australian electorate, and guess how it might have voted in certain Canadian elections by drawing a parallel with a Canadian riding).
That could be an interesting side discussion - Australia with British Columbian parties. Tony Abbot could never lead the BC Liberals- they have no time for social conservatives. Perhaps you could fill the Nationals in for John Cummins and the BC Conservatives (though you'd have to reduce their vote somewhat). The differences between the ALP and the BCNDP are a bit notable as well
