LinkedIn Sent a Notification to My Work Email

My guess is that the notification in question was just letting you know that the person who imported your address is on LinkedIn and wants to connect?

It may look like an account notification but I'd think of it as more of an invitation.

It's not that they've connected your work email to the account with your personal email (publicly at least, privately I'm sure they keep that info). And it's not like they're sending any other types of sensitive/account/password reset information to that address assuming it's associated to the account connected to your personal email.

They're just trying to get you to join LinkedIn and connect with a coworker who gave them your work email address – assuming if you already have an account with a different email you'll login with that and connect with said coworker there.

redbergy's guess is probably right. It sounds like an invitation to join LinkedIn that doesn't necessarily assume that you already have an account.