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There appears to be a much higher ratio (~seven times higher) of Confirmed cases to the population for incarcerated people compared to the overall ratio for all California counties and deaths/population being a factor of two higher for Incarcerated compared to the overall California population. On the other hand, the deaths/population is lower for both incarcerated prisoners and the prison staff compared to the overall California population.
California Residential Care Facilities for the Elderly (RCFE)
A possible source is https://www.cdss.ca.gov/Portals/9/Additional-Resources/Research-and-Data/DSSDS/RCFE-7-24.pdf
This provides cases and deaths by County. However, it does not appear to include the resident or staff totals.
One table, dated in a July 16 report, gives: positive cases = 5528 and deaths 575, giving a deaths/cases of 10.4% which is over five times higher than the ratio for California Counties.