Someone should do mtDNA tests on S Ga Kings to settle this.
Personally, appearances can be deceptive.
Look at the slender salamander - recent dna tests show it is about 20 species or so that just happen to look almost identical.
Appearances can be extremely deceiving. Two things can look just like each other and be completely different species, two things can look like different species yet be the same subspecies.
AFAIK the only way to settle it is in the lab, and you'll probably get disagreement there.
Personally, I like to call them S. Ga Easterns because they are the Easterns I like - and I like to differentiate. If they are pure Lgg or not is unimportant to me. They were not created in the hobby, they were created in the wild. Where they fit into a man made classification system really only matters on an academic level since they are a wild type snake.
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3.0 WC; 0.3 CB L. getula californiae
1.0 CB L. getula nigrita
0.1.1 WC; 0.0.3 CH Elgaria multicarinata multicarinata