大般涅槃經義記 1.181

1.181

空與無我有何差別？空是法空，無我是其眾生無我。初中約就生、老、病、死以說無常。

What is the difference between emptiness and non-self? Emptiness is the emptiness of dharmas; non-self is the non-self of sentient beings. Within the first part, impermanence is spoken of with respect to birth, old age, sickness, and death.