Biggest difference between the limbs is on the right between the red lines. The arc is not quite circular, a little toward elliptical but may be close enough to help.
Of course, if there are curves in the unbraced bow, they have to be considered in the appearance on the tiller stick. A lump in the line unbraced should show up in the shape when drawn. Otherwise, some part of the limb is bending more or less than the rest to make a regular curve.