No, it is like this:

U.S.: 0 (Ground Floor) = Europe: 0
U.S.: 2 = Europe: 1
U.S.: 5 = Europe: 4
U.S.: 12 = Europe: 11
U.S.: 14 = Europe: 12
U.S.: 15 = Europe: 13

Because there is no first floor in the U.S. and then you also skip 13th floor.