New answers tagged mortar
I think you can get away with thinset here. In the big one, you may want to patch one day, and lay the tile the next, giving the filler thinset time to harden. I'd also try to layout the tile in such a way that you don't end up with a corner or edge right over the patch on the large hole. Keep in mind that the floor doesn't have to be level, just smooth. ...
If you only have chips and small holes to fix, the floor patch and leveler will be a sufficient and cheaper. If the holes are minor ( < 1/2" deep and < 1" in diameter), skim coating the area with your thinset and then pulling the notched trowel will safely allow you to bridge with 12x12 tiles.
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