"Clone groups" are just that, groups of clones sent into Phylos and have the same genetic sequence to within the limits of the equipment they use. There is only one Phylos galaxy that contains everything but the names of the clone groups confusingly start with "GAL." Their site is sucky and the nuggets of information are well hidden.
JoshD's OG Kush and CSIH's Triangle Kush, the ones they sent to Phylos at least, are clones, the same genotype. JoshD also sent in a "Kosher Kush" cut that was another rename of OG Kush. It isn't uncommon, apparently, for collectors to end up with multiple cuts of OGK under different names.
My hypothesis that N'Specta was surprised that his TK cut came back as the same as dozens of OGs so he tried testing Phylos. At the time he didn't have any TK S1s he made himself (was only successful in reversing TK last year) so he twice sent in a Chem91 S1 to see if Phylos could distinguish it from the mother. I see no other reason a guy like him would pay a bunch of money to genotype two Chemdog S1s, he even said on the Pot Cast "why would I pay to find out what I already know?" They both came back as different genotypes, distinct from the Chem91 he sent in previously, just as you would expect. Someone should email him ask him.
CSI Humboldt: Chemdog 91
phylos.bio
CSI Humboldt: Chemdog S1 #11
phylos.bio
CSI Humboldt: Chemdog S1 #7
phylos.bio