This differentiation is most likely done by non- theravadins.
I base my practice mostly on theravada texts, and no- self relates to reality, not to me as an isolated practitioner, since the idea of an isolated practitioner is conventional truth, not absolute truth.
If the practice doesn't reflect that, it is inheritantly flawed.
I still feel that mahayana rethoric is based on an hair-splitting attempt to prove spiritual superiority, while causing a split in the sangha.
And intending to save all beings before one has realized reality and cleared the storehouse mind, isn't that just a bit arrogant?