Is the bus station and Amtrak station the same?

Very rarely.

Amtrak is the operator of inter-city train service in the United States. Greyhound is the major inter-city bus service in the United States. Occasionally they will share a station (Milwaukee for example), but usually not. There is frequently a Greyhound bus stop at an Amtrak station allowing train passengers to connect to points not served by trains. But the bus stop is usually just a street corner outside the station and the city's primary bus station is located elsewhere.