A: Yes. ACI 318-14 introduced the reorganization; ACI 318-19 introduced changes to high-strength reinforcing (Grade 80/100). If your project uses 550 MPa rebar, you need the 2019 edition. But for 420 MPa (Grade 60) rebar, the 2014 notes remain highly relevant.
The code requires factored loads (1.2D + 1.6L). The PCA Notes show you the metric workflow . For example: pca notes on aci 31814 metric pdf exclusive
: Design for axial loads and eccentrically loaded conditions using interaction diagrams. Specialized Topics A: Yes