Simple motor, fan can just swap the polarity. L-N or N-L.

Complex electronics like amplifier / TV / Apple TV, have the L-N interchangeable.
The short answer is yes, it's interchangeable regardless if the electronics have DC circuit inside.

But 1 time I found that L-N wrongly cause an issue.
My Microsoft Surface Book. Wrong polarity cause surge issue on the body of the laptop. I get electrocuted.
I need to swap it.

My USB-C charger. Wrong polarity cause leakage current. I get electrocuted if touch the USB-C / lightning cable.
I need to swap it.

So it's not so simple as can interchange it.
But it will work.