Hide invitations on work calendar, only show imminent events

You can manage these notifications in Settings > Notifications > Calendar. This will allow you to configure your notification preferences individually for both invitations and upcoming events. There isn't a "turn notifications off" toggle for them individually, but you can manually disable all of the alerts (sounds, badges, banners etc.) for invitations alone.

I misread the last part of your question. My mistake. I don't know if it is possible to adjust notification preferences for individual accounts. I ran into this issue a while back and never found a solution.

So, in summery this is a no, you can’t have some notifications and not the rest.