If I install a bunch of lighting contactors in a box, is it now an “industrial control panel”?
Industrial Control Panel. An assembly of a systematic and standard arrangement of two or more components, such as motor controllers, overload relays, fused disconnect switches, and circuit breakers and related control devices such as pushbutton stations, selector switches, timers, switches, control relays, and the like with associated wiring, terminal blocks, pilot lights, and similar components. The industrial control panel does not include the controlled equipment.
Only if you systematically arrange them to perform some function such as motor control. Control panels do not have to be factory made. When I worked for Honeywell, I field built many "industrial control panels" both to an engineer's plan and to my own design.