Anyone know if the variant of From the Rooftop/Somewhere in the Silence (Sniper's Theme) exists out there? It plays at the end of the 2nd GIG episode "Poker Face" after Saito tells his story on how the Major recruited him to work for Section 9?

If by the variation You mean version without percussion intro then maybe this can help You:
https://mega.nz/fm/ioBmyIqL
I made it by myself :D

IIRC, it's the one that fade out very slow at the end of said episode.

PS - Your link doesn't have anything.