As far as the Killuminati song, well it's not the same verse.. Both verses are the same up to the "pistols in place" line, where they drift apart.. In the Killuminati verse, the similar parts are a tad more than one half of the verse. In the Swizz Untouchable, the similar part make up to around 80% of the verse, but it's actually less than half the actual verse of Untouchable, which is the OG verse, where all Pac's part is in only 1 verse (not in 2 like they split them up in Swizz's version). So by no means is this "verse" repeated.. Plus as it was pointed out before, this is a whole different recording. Pac just used the same lyrics as parts of 2 different verses.
And as far as the OG, well there's an OG for almost all the songs on Pac's Life, but still they are all new releases, as in official retail releases. For the general public, and the official record, there is only one re-used verse, which is the 2nd verse on Pac's Life.
Peace.