I would argue he is much closer to the tsars in the following aspects:
- incestuous state-church relationship (it took for WWII to happen for Stalin to let a bit of leeway to the Orthodox church) to enforce the state legitimacy;
- dreams about re-building an imperial Russia directly under Moscow rule (Stalin focused on “Socialism in one country” after the failure of the USSR/Poland war and then went down the “buffer-states belt” policy post-WWII);
- deliberately exhibits lavish luxury (Stalin had a life style that was closer to wealthy retired US surgeon – by which I mean a couple villas and nice cars – than imperial Archduke)
- and no realistic, well-anchored long term view for the country – safe for making him and his cronies wealthier (this is not an apology of stalinism and its hundreds of thousands of murdered, but at least Stalin had an idea of where the Soviet Union was, where he wanted it to be, and what was materially required for that).