My take on this:

All SS men had an SS number. Those of the officers were recorded in a rank list that was published several times between 1934 and 1944.

There is no similar central reference for enlisted men.

Numbers? A man had only one SS number. Many of the officers also joined the Nazi Party and had Party numbers. Presumably, some or many enlisted men also joined the Party.

Besides those, some may have been members of the HJ, RAD, SA, etc previously and had numbers there too.

Dave