Yes, you can generally use the same capo for both acoustic and classical guitars. Notably, the primary role of a capo is to raise the pitch of the strings, making it universal across different guitar types. However, given that classical guitars use nylon strings and acoustics use steel, some capos are specifically designed to better fit one or the other. Therefore, always check the capo's compatibility with your guitar type to ensure it doesn't exert excessive pressure on your guitar's neck.