When changing existing factions to a completely different faction (i.e. changing romans_julii to Kings_of_Leon), that is all done in strat.txt/shared.txt/expanded.txt, according to the faction renaming tutorials I've read.

So, when editting the descr_strat.txt file, does that mean I need to leave the highlighted text below as is for things to work?
; start of factions section

faction romans_julii, comfortable caesar
denari 5000
settlement
{
level large_town
region Etruria
Or do I change it to the following?
faction Kings_of_Leon, comfortable caesar
trendel