I think they probably come up with some pretty designs which for some reason don't fit into a pack but they don't want to throw away, so they may occasionally end up in kits. Country kitchen might have been designed initially for the cottage living pack but they couldn't add two kitchen designs to that pack due to budget or object limit constrains and settled on the kitchen design that eventually shipped with the game but also liked the aesthetic of the country kitchen and decided to put it in a kit. The industrial kitchen however doesn't really fit with the werewolves aesthetic, it's industrial looking but not made of bits and pieces like the werewolves reclaimed furniture is.