Shaq had a much higher PPG, slightly higher RPG, slightly higher BPG, which are the main three stats for bigs. He had, i would say quite a few less asts (0.5 out of 2.5 is pretty big), but way higher FG%. I took the counting stats as in Russell and Wilt's years, they didn't really have advanced stats were heavily estimated.
https://www.basketball-reference.com/about/ws.html
They didn't have BPM or VORP in those days.
In other words, if you want to compare Russell to Wilt, and use stats, the only stats were pretty much counting stats, which to keep consistent, I can only do for Duncan and Shaq, and it's pretty clear Shaq was better counting stats wise.