Until we wait for someone with more expertise to answer, I can tell this: drill bits are usually longer, more flexible and have only two flutes, and a sharp point. Mill bits (or endmill bits, I suppose) are short, hard, very sharp, with 2,3 or 4 flutes, can be flat or ball end, you can drill with them (but hard to center a mill bit over the marker), you can use one in drill press (not so good on cheap drill presses for the ball bearings, unsafe too), they're designed for cutting laterally........
Yes, you can drill with CNC...
No, you cannot mill with the drill bits, they are not designed for side cutting, not so sharp and will snap easily...
Huh, now I got one Q too, is there a difference (and what) between mill bit and endmill?
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