I tred carefully and maybe I\'m wrong but for me its the general ambience and the 3d placement which gives example two away.
This will be an area which Giga would benefit from piping through an excellent reverb and 3d positioner. The first one just sounds a bit too `perfect` so a bit of light grungifying would probably add enormously to the realism. If you had this Donnie I\'m sure you could fool us all.
Hmmm interesting in a way though because what you are asking us to compare and contrast with is not an actual instrument but a recording of an instrument and maybe its the grunge of the recording which gives it away.
This, of course, is the perfect moment to make fools of us all and reveal your samples as number 2.