Is metal gear solid 1 the same as metal gear solid 2

Well with any series there are many similarities but MGS and MGS2 are two different games.

Differences:

MGS is for the original PlayStation and MGS2 is made for PS2.
MGS was released in 1998 and MGS2 was in 2001
MGS2 has improved graphics compared to MGS
Different Story
etc etc

Similarities:

Same style of gameplay (i.e. stealth)
Reoccurring Characters
etc etc