How to increase brightness in mutliple files to same extent

Hey guys, I have about 10 different files containing the same base logo but with little deviations and different color hilights. I printed these files, but unfortunately the appear to be a little to dark after printing.

Therefore, I want to increase the general brightness of all shapes in my logo. Important is that the increase should be the same in every file. The only way I'm aware of is to select the logo and navigate through the menu until:

Using this slider I can change the brightness. However, as I do not see any stepwise increase or increase over percentage, there is no way to guarantee the same increase across my files. Is there another option you might see here?

Thanks!