There are differences, but they aren't worth worrying about. You are still vulnerable to being abused by Google's data about you as well as Facebook's data.
Now I’m using Firefox Multi-Account Containers to separate Gmail from the rest. And I am considering switching entirely to ProtonMail.
Have they guaranteed this in writing somewhere, or is this just something that you're saying? It's harder to put together a profile that's not personally identifying than one that is; what if I ever used google maps to find directions from my house?
The average person doesn't read or believe a website's stated privacy policy any more than they read or believe a tech product's EULA.
I could list a thousand companies who say one thing, and do another. I find it extremely naive to believe them at face value.