There are a few key differences between Ragdolls and Birman cats. One is that Ragdolls tend to be larger in size, with males typically weighing between 15 and 20 pounds and females usually being around 12 pounds. Birmans, on the other hand, are more medium-sized cats, with males averaging around 11 pounds and females around 9 pounds. Another difference is in the coat - Ragdolls have long, silky fur that is easy to groom, while Birman cats have slightly shorter fur that has a bit more of a plush texture. Finally, Birman cats typically have seal point coloring (darker points on a lighter body) while Ragdolls can come in a variety of colors and patterns.