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This is actually possible for Gmail as well, although they have a UI for it. I discovered this when I tried to log in to an old business account on a custom dom

This is actually possible for Gmail as well, although they have a UI for it. I discovered this when I tried to log in to an old business account on a custom domain (say, admin@example.com) and received a prompt to the effect of "The account admin@example.com is associated with both a G Suite Mail account and a Gmail account." with a list view of (two) accounts to choose from. My conclusion at the time was that someone had associated a paid individual Gmail account with admin@example.com using the custom domain feature, and later created a G Suite account with the same name. I have no idea how they decide which account (or both) receives an incoming message as I only had the password for one of the two admin@example.com accounts.

mattzito 5y ago
There’s actually no such thing as a paid gmail account separate from a g suite account- there is only gmail.com (consumer) and @domain (paid g suite/workspace). But it may be possible that you or someone else created a Google account for admin@example.com, and then separately provisioned a g suite account for the same address with a different password. This is not at all uncommon, as lots of people sign up for a Google account with their work email address for use with search and YouTube and so on, and then later their employer switches to Workspace for email and suddenly there’s all these conflicts. There is a process for merging and claiming these, but I don’t remember how it works off the top of my head. But to answer your implied question - there are two accounts, but only one mailbox. If you chose to log in to the Google account, you would not have access to gmail. (Source: work on workspace@google. Obviously only my own opinion)