How are taste and smell the same?

They are not the same.

Taste is sensed by the taste buds in your tongue and comes only in 4 categories - salty, sour, sweet and bitter. Sometimes savory is added to these categories.

Anything on top of that is picked up by our olfactory system (smell). Nose and mouth are closely connected and our olfactory sensors need only traces to be triggered (the traces in our breath are enough!).

People with little or no sense of smell don't taste food the same way as the majority of us.