>But more importantly -- this has taken place from 1990 to 2020. Have there been big demographic shifts between rural/urban in that time?

In Western countries, yes.

  Country        Year  Urban Ethnic Makeup                   Rural Ethnic Makeup           
  -------------- ----- -----------------------------         ------------------------------
  United States  1990  73% White, 14% Black, 8% Hispanic     | 86% White, 11% Black, 3% Hispanic
                 2020  57% White, 12% Black, 18% Hispanic    | 84% White, 8% Black, 9% Hispanic 
  United Kingdom 1991  90% White, 4% South Asian, 2% Black   | 97% White, <1% South Asian, <1% Black 
                 2011  75% White, 12% South Asian, 6% Black  | 97% White, <1% South Asian, <1% Black 
  South Africa   1991  14% White, 77% Black, 9% Coloured     | 15% White, 68% Black, 17% Coloured 
                 2011  14% White, 79% Black, 8% Coloured     | 11% White, 77% Black, 11% Coloured 
  India          1991  69% Hindu, 14% Muslim, 11% Other      | 69% Hindu, 14% Muslim, 13% Other 
                 2011  63% Hindu, 17% Muslim, 11% Other      | 68% Hindu, 15% Muslim, 13% Other 
  China          1990  91% Han, 2% Mongolian, 2% Hui         | 89% Han, 5% Zhuang, 1% Miao    
                 2020  92% Han, 1% Zhuang, 1% Hui            | 88% Han, 6% Zhuang, 1% Miao    
  Peru           1993  53% Mestizo, 31% Indigenous, 16% White| 73% Indigenous, 23% Mestizo, 4% White 
                 2017  60% Mestizo, 16% Indigenous, 24% White| 74% Indigenous, 21% Mestizo, 4% White