Raymond,
you have a great collection! Congrat!
Your 1st pattern Abteilungsführer shoulder board is wonderful!
IMHO 2nd pattern BZP colar patches (MVC-016S.JPG) is for ranks BZP-Anwärter - BZP-Gruppenführer.
MVC-024S.JPG (2nd pattern with silber cord is for ranks BZP-Unterzugführer -
BZP-Oberzugführer.
ON photo (MVC-018S.JPG) are 1st pattern rank insignia (Anwärter) with (probably) 2nd pattern Ärmelabzeichen & cap devices -must be taken after 1936 to 1938, I thing.
I'm not very good in RB - so I don't know pay grades of RB.
It is very little sources about BZP, most of my knowledges are from great David Bear's site (David H. Kern, Ph.D.)...
Could You tell me color of band of Your fieldgray visor? Piping is black, but the color of band is not clear (from my screen)...