With both wings setup on the table I could compare using a string line to get the relative dihederal and sweep angles.
Once established FC1 was cut off the left wing and as you see in Pic 3 was rejoined at an angle that matched the right wing. This was over a week or two and a lot of effort expended. I hope I have two matching wings and time will tell.
For now I've done all I can and it was a matter of stowing the left wing and getting on with the next step.