Its recommended not to add new breastmilk to old, or warm to cold.
If yesterdays is in the fridge put todays in there till there the same temp, then mix them and stick them in the freezer, should be fine, can't see as one day would make all that much difference. Or if you have an ice cube tray you could freezer in that and then transfer the cubes to a freezer bag, that would keep the two different lots of milk seperate.
You can mix them. I used to put the first lot in the firdge to cool it down and then in the freezer. Then the second lot would go in the fridge to cool it right down and then pour it on top of the other lot.
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