I'm not sure if you read my post or not but it seems you have a misunderstood distinction: This isn't a sped-up version. This new leak is how the song is supposed to sound. The pitch in Pac's voice is the same pitch you would hear if there was a camera in the studio with him, and you were listening to the camera recording instead of the song.
The Greatest Hits version is a slowed down version of the original, not the other way around
And I agree, the speed/pitch on the OG sounds way better. Probably because that's actually Pac's voice. Now if only it was mixed the same way as the GH version.