It’s not “wrong” to mix different panels but there are consequences.
Here is the best explanation I have found:
Mixing solar panels – Dos and Don’ts • SOLAR POWER SECRETS
Mixing Solar Panels: Discover Now Dos and Dont's of Mixing the Same Types or Different Types of Solar Panels. Act Now to Save Your Money!solarpanelsvenue.com
That's exactly the article I referenced that's not accurate.