The Japanese term カステラ (kasutera) and the Korean term 카스테라 (kastera) are etymologically derived from the Portuguese "Pão de Castela". But does "kasutera" and "kastera" refer to the same foodstuff, or a different foodstuff?
KOREAN CASTELLA CAKE says:
I’ve come to the conclusion that Koreans use “kastera” to describe almost every type of baked product that’s Western in origin.
These baked products are a cheap, guilty indulgence -- they are good -- but I don't consider them "genuine" Japanese kasutera, which I have come to understand is not as spongy and comes in a rectangular shape.
Are they the same foodstuff, or are they different foodstuffs? Would it be more logical to say "I prefer kastera over kasutera", or would "I prefer the way Koreans do kastera over the way Japanese people do it"?