Changelist (2372379) is the same in NA2, NA8, NB4, NB5. I think it's an error from Samsung and the rooms are not to be the same. NA8 NB4 NB5 are newer than NA7 (at least after the build date, i think)
I saw that all the I9505 (S4) 4.4.2 firmware have the same changelist
Newer NB6 has the same changelist as NA7 , not understand anything
Changelist is being generated automatically during building the ROM, you can trust whatever you want, if ROM built yesterday from half-year-old sources satisfy you only because it was built yesterday, feel free to use it. I trust the changelist.