Yes also spoke of ROYAL Law, which is really in Jewish terminology, mishpatim, or basic. In fact James recites two of these of the Ten further down:
For he that said, Do not
commit adultery, said also, Do
not kill. Now if thou commit
no adultery, yet if thou kill,
thou art become a transgressor.
Also called the Law of Freedom, since extensions of Law are extending in believers from the Circumcision of the Heart, Deut 30, the desire and will to love God.
And YES spoke of Royal Law, probably an idiomatic way of saying Basic Law.
The Hard Sayings of Jesus all fall under Mishpatim, to Love God is to X and Y, neither variable necessarily covered by either the Ten, or the 613. These fall under Shema, an extension of loving God.