I think the rebate is money you get back out of your out of pocket expenses and the other is the assistance they give you to help pay each week.
I can't win- we bought a house so now have a mortgage of $2000 per fortnight instead of $840 rent so i went back to work F/T. I earn another $400 f/n now but i lost $123 family tax payment and my child care went up $40 (no more days just got less help) and my dad minds DS for free every friday.