Well ‘fork’ and ‘chopsticks’ is the best example. They serve exactly the same purpose when eating food. ‘Toaster’ and ‘Rice Cooker’ are two different types of cooking devices, but their purposes are very different. I don’t think toast in America has much equivalence to rice in Japan. A potato cooker might be a close comparison, but those are uncommon. I’d say ‘fork’ and ‘chopsticks’ are highly analogous, and ‘Toaster’ and ‘Rice Cooker’ are only indirectly related through a single shared characteristic. So your example are highlighting both small and large differences in cultures.
An “electric teapot” is a default kitchen item called a kettle in most the rest of the world and its primary purpose is to boil water - usually, but not always, to make beverages.
The bidet’s primary purpose with regards to butts in many of the countries in which it’s used (read: Europe) is not “to clean the butt”, but “to finish butt-cleaning when toilet paper is not enough”. It is complementary to TP, not its alternative.
Other uses include footbaths (alternative would be a shallow, large plastic bowl) and genital douches (alternative is a wet cloth or towelette).
coffee : tea : yerba mate : hot chocolate – hot caffeinated beverages. I may be missing a few; most cultures have some beverage in this category. Much like Swedish meatballs
