Yes, I agree with you. As far as the Xt Intrinsics are concerned
Emacs*font-lock-comment-face.attributeForeground: turquoise4
Emacs*EmacsFrame.font-lock-comment-face.attributeForeground: turquoise4
should be identical with the only difference being the second one
being slightly more specific. Given the uniqueness of the last two
names I find it hard to believe there is a problem. Remember, it's
better not to force the widget hierarchy on the user as that makes it
impossible to change in the future.
--pete