Essentially, you cannot group items that are fundamentally dissimilar, such as a bag with wheels beside one with a shoulder strap. While they may perform similarly, you could not respond “yes” to any of the above questions.
This becomes more complicated, though, when you offer numerous items in a variety of styles and colors. You may not notice the distinctions (they are, after all, the same product). nevertheless, a consumer will. It has a direct effect on their purchasing experience, which is important to Amazon.
Consider selling coffee cups in a variety of colors and with a variety of various sayings. If all the sayings were generally available in each color variation, you could build a variation family based on the color variation theme for each saying. However, if the blue cup just reads “Best Dad Ever” and the pink mug only says “Best Mom Ever,” you could not lawfully put this up as a simple color theme variation. The picture below helps you visualize this situation – see the difference?