Are you talking about 1G, straight line flight? If so, I disagree. Actual lift stays constant (it has to equal weight, which is constant) throughout all speeds. So CL varies inversely with speed. As long as we're not close to the stall, CL essentially means AOA from the pilot's perspective.
MAXIMUM CL is fixed (as is AOA) and MAXIMUM lift varies. But these maximum values define the limit of the V-G diagram (to the left of Va), not straightline flight.