I will try to find an answer for you but even if there were two imports we don't know what we are doubling. Here is what happened with the Cream Legbars. As I said there have only been 11 imported..... if you want to get technical there were 15 but 4 were lost to Mareks.
In September 2010 the first shipment arrived. There were two groups, 1 rooster and 4 hens from one flock and a trio from another flock. After a bout of Mareks there was a trio left from the original 5 and one rooster from the trio. The trio (three remaining from the original 5) became the A line and the female offspring of line A were bred to the unrelated surviving rooster (from the trio) and became the B line.
In October 2011 a trio arrived. They became the C line.
In September 2013 they imported two pairs of Jill Rees CLs.
We know it is tight with the B-la-felders too.