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There are only three Atlantic species in the genus, two of which occur in the Gulf of Mexico: C. saburrae (Florida Blenny) and C. longimaxilla (Stretchjaw Blenny). The latter has a larger upper jaw, but there's not a lot in it. I couldn't find anything on coloration differences. The main differences between the species are not observable on live individuals (e.g., counts of gill rakers). Sorry I couldn't be of more help.
Combtooth blenny is the name usually given to the true blennies (family Blenniidae), to distinguish them from the other blennioid families. So, yes, they are combtooth blennies, but so are all true blennies!