There’s really no difference between Karaite and Rabbinic slaughter or butchering for food consumption.
It’s up to the individual Jew to inspect the meat they purchase.
The main difference is in mixing meat and dairy. The Karaite tax boil a calf in its mothers milk to be literal, so the strict separation of meat and dairy utensils is not required. This is an area which makes Kosher eating, and living very expensive for many.