Absolutely ... the size of the conductors does dictate which box to use do to overheating.
Also electricity does create heat and vibration over the conductors, you may not see it with your naked eyes but it's there.
I've seen training and safety films where they purposely stress the wires well over their designed capabilities and WOW you can really see those babies flex and twist.
SIP Panel Electrical boxes?
Looking for a few boxes of Prodigy Amber Oak Pergo.
Condensation in ceiling light electrical boxes
Winterizing Window Boxes
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