The main difference between SRC20 and ERC20 token standards lies in their purpose. SRC20 is specifically designed for security tokens, providing compliance and investor protection features. In contrast, ERC20 is a general-purpose token standard used for utility and fungible tokens. While both standards are based on the Ethereum blockchain, SRC20 incorporates additional functionality and regulatory compliance measures tailored for security tokens.
source:https://www.inoru.com/src20-token-development