So while this wasn’t the case for your examples, this has happened in the past.
e.g.
2K is still doing it.
https://isthereanydeal.com/game/sidmeierscivilizationvcompleteedition/history/?shop[]=steam&generate=Select+Stores#/
You’ll need to pay attention to the discount percentage if using steamdb, since it tracks effective/sale price, and not if the price was raised at the same time to show a bigger percentage discount. istheranydeal shows the base price changes as well.