koonacs - Cherax preisii vs C glaber solved

Ok, finally I think I have enough confirmation to say which is which. I checked at the Western Australian Museum, they had a specimen labelled Preisii, I have a poster that labels the same crayfish as cherax preisii and finally, under koonac in a new book on Australian crustacea preisii is shown the same way. Until I see C glaber labelled though I cant be certain, but so far it looks like koonacs with the large knob inside their "finger" as with brutus are Cherax preisii, the commonly shown pic on the net of preissii is actually Cherax Glaber.
i'll collect some pics etc later on.