Section 504 is a federal law that prohibits any entity that receives federal financial assistance (such as grants or student loans) from discriminating against persons with disabilities.

Title II of the Americans with Disabilities Act is a federal law that prohibits state and local governments (such as public school districts, public colleges and universities, and public libraries) from discriminating against persons with disabilities.

In general, Section 504 and Title II nondiscrimination standards are the same, and in general, actions that violate Section 504 also violate Title II. However, where Title II requirements exceed Section 504 requirements, public school districts, colleges and universities, and libraries must also comply with the Title II requirements.

From Here.