RGB Pdf from Illustrator

so RGB pdf from Ilustrator....? I need to safe logo from Ilustrator as RGB pdf and colour numbers need to hold as per how they are in illustrator.

My illustrator document is in RGB (working space is Adobe 1998) when I make the pdf I save as pdf my and settings are as follows

I have tried both include profiles and don't include. The pdf that is made is RGB however the colour numbers change. How do I get the RGB numbers in the pdf to stay the same as the RGB numbers in the illustrator document?

Illustrator version 26.0.3

Thanks in advance