There are some illustrations of regimental uniforms in the book by Peter Stanley: The Remote Garrison, The British Army in Australia. ISBN 0-86417-091-2 which I was able to look at, at a local library. I will try and attach a bad photo that I took for my own research as I have an ancestor who is reported as serving in the Buffs as an NCO. I am a beginner amateur, you may wish to access the book yourself as it has a range of uniforms illustrated in it. It certainly does look similar.