1030 and 1030 are the same with different covering. 1220 appears to have an inch more wing.

My guess is that they are all the same basic plane. Probably all built by the same people. I would call tower and ask the diff to make sure but there can't be that much diff. One probably measures from the leading edge for leangth and the other the trailing edge. The tip is angled. Other than that, they should be the same.