Is there something in Levels I can't do with Curves?

Hi
Just curious if there is something in Levels I can't do with Curves?

You're right, I didn't read your question right, so my answer is no. Everything you can do in levels, you can do in curves.
To invert a curve, you just grab the end points of the curve and move them to them so that the cuve line is sloping the other direction.  Here are some samples of inverting each of the channels in L*A*B*
Top left: normal; Top right A channel (green-magenta); bottom: left B channel (yellow-blue); and bottom right: lightness.

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