Comparison between The Sims 2: Open for Business and The Sims 3: Ambitions

Features in both

 * Business
 * Inventing
 * Stores
 * Cash Register
 * Salon

Features in Open for Business not in Ambitions

 * Elevators (in The Sims 3: Late Night)
 * Kite
 * Servos (return as "SimBots")
 * Other robots
 * Bakery, though some baked foods exist from The Sims 3, and Ambitions allows a bake sale
 * Floricultures
 * Lemonade Stand

Features in Ambitions not in Open For Businesss

 * Laundry (new in The Sims series)
 * Tattooing
 * Firefightner, Private Investigator, Architect, Ghost Hunter, and Doctor career
 * Professions
 * Simbots (in OFB as "Servos")
 * Trampoline (in The Sims 2 for PS2)
 * Sculpting