Is ancient Greece and classical Greece the same thing?

Try to picture San Francisco during the 1840's. The "Gold Rush' days with all the grubby, primitive, opportunity seekers. Dirt streets, relative lawlessness, dog eat dog, but with much promise.

Now compare that image with what is today's architecturally dazzling San Francisco. Refined, culturally superior. The "Kingdom of Snoot." Considered by many the world over to be our most cosmopolitan and beautiful city, in the bay at the Pacific Ocean. The difference between "Ancient" Greece and "Classical" Greece is very similar, relative to modern times.

I hope my comparison offers clear way to "see" the difference in your mind's eye.