[ccp4bb] is it valid to compare the B factors of corresponding domains or regions of molecules from different crystal structures

[Michael Murphy]

I am looking to compare the B-factors of a particular stretch of DNA bases
when bound by several different proteins. I have crystal structures for
each, but the structures are of different resolutions and also then
different Wilson B-factors. Is it valid to compare those B-factors
directly? (probably not) or to set the B-factors from the different
structures to a common scale based on the Wilson B-factors from their
respective data sets?