Not the same mast. Notice the mushroom or rivet shaped joint visible at the same level between the 2nd and 3rd floor of the St. Charles absent from the first photo. The older mast with climbing struts doesn't have that feature.
Look closer. I suspect the newer version was collapsible telescopically at least by half for servicing.
...and furthermore, what do you see beyond the dried-out yucca stems in this Campo Santo photo from 1890?
I calculate this lighting mast (no climbing struts) to be nearly center (maybe north-western edged) to the Plaza.
Different from the Plaza church rectory fronted "climbing" mast shown earlier.
http://digitallibrary.usc.edu/assets...CHS-3868B?v=hr