I saw you recently created two projects, one for light and another for dark adapted leaves. If you wanted to compare these two inside the same project you can set that up. You could add a question to either project saying "Light?" (or whatever) and then your answers could be "Light" and "Dark Adapted" this way, before you take a measurement of a leaf, you define it and later you can compare measurements from both sets.
Might be easier then going back and forth and comparing, but up to you!
Sean at PhotosynQ