Kahl strain - also called the 'original strain', was founded by Peter Kahl from a wc male albino, part of 4 that were originally imported to the US from Colombia. follow the link for the history
http://www.pkreptiles.com/informatio...albinoboas.asp
Coral albinos are selectively bred kahl strain and look pretty much like normal albinos when born and then start getting heavy pinks and oranges, especially around the head, as they grow, generally showing up around the 3-4' range (at 2-4 years of age).
Lipstick albinos are also kahl albinos that have been selectively bred for high red coloration,
line started by the Burkes (please someone correct me if I am wrong!).
There are other selectively bred strains, Boaphile has pastel albinos, Matt Crabe has his 'redline' albinos and I am sure there are more out there.
sharp strain was started by Brian sharp from a WC female boa (pic of her in the Boa Constrictor Manual).
Kahl and Sharp strains are not compatible, if you breed the two strains together, you get normal looking double hets (according to Brian Sharp who did this breeding, babies were either culled or sold into the pet trade (possibly only females sold in the pet trade) I've heard both versions of the story).
Kahl albinos tend to have more pink/red tones while sharp albinos tend to be more orange toned. It used to be that kahls were considered more just yellow snakes while the sharps tended to hold their color better into adulthood but with the years of selective breeding there are beautfiful high color animals from both strains. The only way to know the difference really is to buy from a reputable person and ask for history/paperwork on the parents.
Hope that helps!