Similar dynamics in what way? Certainly there was no nominal wealth inequality in the USSR (there were of course people with wads of illegally obtained cash, and there were classes of people with access to a lot of things [which money couldn't legally buy] that the majority could not access, but officially wealth and income were very similar for everyone, in particular you couldn't legally own most sorts of assets traditionally held by investors, including real estate. So I wonder what sort of inequality correlated with life expectancy inequality in the USSR in the late 60s.)