No, they need not contrast.
The courses at PGA Reserve (North and South) and Bonita Bay (Bay Island, Marsh, Creekside) and Orange Co. National (site of '03 Q School) are similar.
World Woods, Grand Cypress, Champions Gate, and others offer different feels.
An interesting study is Bonita Bay, where the first 54 share the same characteristics and the next 36 (off-site) also share a vibe - but are completely different than the first three courses.