The Rehabilitation Act of 1973 applies to federal employees, federal contractors, and other programs that are recipients of federal funding, whereas the Americans with Disabilities Act of 1990 applies more generally to employment, places of public accommodation, government services, transportation, and telecommunications.
The Rehabilitation Act of 1973 mandates affirmative action and nondiscrimination within executive agency hiring. It also requires that federal contractors and subcontractors with of more than $10,000 use affirmative action in hiring and prohibits discrimination.