The answer is no, not all 10 speed cassettes are the same. In fact, there are quite a few variations between different brands and models. The biggest difference is likely the cog sizes, which can range from 11-25 teeth on the low end to 11-32 teeth on the high end. There are also variations in materials used and weight. Some cassettes even come with special features like titanium cogs or a wider gear range. So if you're looking to upgrade your drivetrain, be sure to do your research and find the cassette that best suits your needs.