(1) The following provisions, as amended or inserted by the amending Act, apply in relation to an injury suffered by a worker only if the injury is a post-commencement injury:
(a) section 4;
(b) section 61B;
(c) section 65C;
(d) section 73;
(e) section 75A;
(f) section 84;
(g) section 85;
(h) section 87;
(i) section 103F;
(j) section 167;
(k) section 170;
(l) section 171;
(m) section 172;
(n) section 173.
(2) The provisions mentioned in subsection (1)(a), and (d) to (n), as in force before the commencement, continue to apply in relation to injuries other than post-commencement injuries as if the amending Act had not commenced.