I'm not aware of any EV that requires/recommends differential oil change schedules. Pretty much all fluids in EVs are 'lifetime' because there's no chance of fouling caused by engine blowby, unlike gas cars.

Even gas cars typically have 'lifetime' differential oil fills these days. With no chance of contamination from blowby, there's not really any other mechanism for degradation besides oil just degrading over time from heating/cooling.