I'm not sure if by 'light blue' you are meaning the aqua, or the lighter of the two blues. I'm going to refer to the blues as medium and dark blue, and to the aqua as aqua.
If you are meaning that you've made a certain number of geese with green and dark blue and you now need to make a certain number of geese with green and your medium blue, that is right -- the blue and green geese could be made with either the dark or the medium blue, as long as there is good contrast between your chosen blue and the aqua. We do not make any aqua geese with green wings. But you will need more (sets of 4) than the total number of full blocks, because you will also need two blue/green geese for each half block (for setting) and one blue/green goose for each quarter block (for the quilt corners). Looking at the finished quilt top diagram is a big help.