No, not at all. Maybe Mort can go into explaining differences that exist, but they aren’t the same, though many therapists may incorporate elements of both without thinking about it if they have been exposed.
Both can be equally effective for removing scar tissue. The main thing comes down to the practitioner because there are crappy masseuses and crappy ART practitioners alike (and good ones for both), but ART does give you a sort of minimum standard of care