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This presumes that you are the same person after a seizure, or even after a nap, or even after half a minute of ordinary life, or even a unitary "person" to begin with.

That's a philosophical question (i.e. useless).

You are same enough for practical purposes like holding relationships and retaining knowledge and skills.

Does an epileptic seizure modify the slow brain wave activity? It would have less data due to a smaller sampling rate but still might be necessary to avoid "total refresh"? Have we EMPed brains before to see if they lose any prior memories?

Afaik, ECT therapy has been despised by many folk for making them forget whole weeks of their pasts.

The question is whether the electricity is causing changes or just interrupting existing flow....

You might be interested on https://waitbutwhy.com/2014/12/what-makes-you-you.html

... intersting but some ideas are bit silly. You can't copy brain to brain. No two brains are the same. You have to copy whole brain.