Different Live Z for Different Spools?  

Different Live Z for Different Spools?

I have the following spools:

• 1 Roll of Silver PLA, unknown brand, Live Z = -1.615
• 1 Roll of Ultramarine Blue PETG, Prusament, Live Z = -1.515
• 2 Rolls of Prusa Orange PETG, Prusament, Live Z = -1.615 (can't double check this right now, in the middle of a print)

I have a third roll of Prusa Orange that I haven't opened yet, so I don't know if it will be at -1.615 also. Is it normal for all spools of one material and color to have the same Live Z?

Observations of those rolls:

• The Prusa Orange goes down beautifully. When I check the bottom of the print, I see absolutely zero evidence, aside from the bed texture, that this came out of a filament printer. This orange is set it and forget it. I don't even feel like I need to watch the first layer go down.
• The silver I can see the lines from the printer, but I don't think I should go any lower. The top of the first layer is kind of "hairy".
• The Ultramarine blue was a NIGHTMARE to print with when I was trying it at the same Live Z as the Prusa Orange. Just CONSTANT boogering on the first layer. I was pausing the print every few minutes to clean the bottom of the nozzle. I raised the Live Z by 0.1mm and it is better, but not nearly as easy as the orange. My wife wants me to do a 56 hour print with this blue, and it has me worried.

So, I know that different sheets with different textures require different Live Z's. I think it is normal for different material types to have different Live Z's. I wasn't really expecting that different colors of the same material to have different Live Z's. Is this normal?

Related question... is Ultramarine Blue just a PITA to print with, or do I just have not have the Live Z correct just yet?