Is buying from the Apple website VS Apple Store any different?

I am interested in buying the new Apple MacBook Pro 15''. I wanted a somewhat personalized version though (500 GB SSD / 16 GB ram) which is not the "basic" one.

My question is this: does the Apple Store have all kinds of combinations, hence buying from the website or from the physical store is identical, or the Apple Store has only the "basic"/default configurations and if you want more (e.g 500 GB SSD vs 128 default one) you have to buy online?