The difference is that the LYS system is not a pure measuring system with secret formulas (no kidding). They also mix statistics into it, so the crew factor can be even more important in LYS. It's no worry for us, we almost never go to LYS events with other multis, but it is a flattering number. I expect the numbers to drop as the results database grows?
The numbers being so similar suggests the LYS committee did not ponder the issues much, they just used the A cat and F18 numbers <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />