They have a good chart for the changes in gas for various Temps.
They also make it clear the differences if the O2 is say 2ppm vs 5 ppm in the fish's ability to handle high levels of CO2.
This reference is for naturally occurring non CO2 enriched systems. Enrichment changes things.
You can see the pH movement with high vs low KH water, but realize that if we supply plenty of CO2 CORRECTLY, the pH should remain unchanged in both cases.
In non CO2 enriched systems, the illustration is the case.