How to avoid affecting rankings when merging Amazon parent-child variations?

When merging Amazon variations, the biggest mistake is focusing only on how the page looks rather than the backend logic. Two ASINs might look like a set in terms of color, size, and model, but if the category, attributes, images, and user purchase intent don't align, forcing a merge can easily mess up both your conversion rates and rankings. I learned this the hard way: I merged a…