Different flow rate with different coolants

I did not know this before. I was normally using EK Cryofuel clear in my loop and i had a flow rate of about 205 L/h with my DDC at 100 %. One day i flushed my system with pure destilled water and used it for a few days and noticed a higher flow rate of 230 L/h at 100 %. Now im using Aquacomputer DP Ultra clear and im back to 205 L/h. Did somebody noticed the same? I guess its because of the diffrent viscosities of the fluids.

My loop consists of:

EK Supremacy Evo AM4

5700 XT EK full cover block

EK Coolstream PE 240

XSPC TX240

Aquacomputer High Flow Next

Aquacomputer Quadro

Iceman Ncase M1 DDC res/combo

EK DDC 3.2 PWM

8x 90 ° adapter fitting

EK ZMT Tubing 16/10