This paper contains a mapping from CB05 to CB6
https://doi.org/10.1080/10962247.2018.1496954
The following issue also discusses how to do the aerosol mapping.
Does old emission input data work with new version of CMAQ-5.3.1?
I am including an updated link that was broken in the above issue.
CMAQ/aero7_overview.md at 5.3 · USEPA/CMAQ · GitHub
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