Yes. For example, the fit of a size 9 Lucchese boot might be different from a size 9 Ariat boot, so it’s important to spend time getting a good feel for every pair of boots you try on.
For instance, let's say you finally got your boot size figured out and you are a 11D. Now you are ready to grab your perfect pair and start trying on boots in different brands. As your are doing so you grab a pair of boots from a different brand in the same size, and suddenly they feel off?
Well, not all cowboy boot brands are going to fit exactly the same. Even if the size on the boot is the same, it may feel completely different. When making a boot, each brand uses a wooden mold that is called a last to achieve the size and fit the brand desires. Each brand uses different lasts, so the shapes can vary, which is why some brands fit differently.
So, it is important not to get discouraged while trying to find your perfect pair of boots. Try on different brands and get a feel for your size in their brands. But, once you find your perfect fit, you may not want to wear anything else.