The only difference is that the fundamental civil right to bear arms for your own defense has not been "granted" protected class status like race, gender, national origin, color, sexual orientation, ethnicity, religion, or disability.
SCOTUS did say the RKBA is a fundamental civil right bit did not rule in a way that gives it "protected class" status, and that is the level of protection needed to bar private individuals and companies from violating ones right to keep and bear arms