East Coast Swing is an American Style of dance (Rhythm) and Jive is an International Style of dance (Latin). They each have their own syllibi from beginner to advanced- Jive has a strict syllabus of steps, but you can find different syllibi for the Swing. Yes, they have steps in common, often named differently, because the Swing has a 'loose' syllabus, you can do Jive steps in Swing, but to the Swing tempo. E. C. Swing also has single, double, and triple timing.