I bought the filter and I couldn't install it.  there were minor differences compared to the old filter, but very insignificant.  the plastic got scraped, when I tried to turn the filter in the grill.  the old filter goes right in.  I tried a few times, and it ended up causing a water leak.  I've owned the fridge for 16 years, which means I probably replaced 32 filters.  Never a single issue, but never purchased from KitchenAid until now.  The only answer was to send a service technician that I would have to pay for.