Is the storage space of pimary user mailbox and recoverable items shared ?

As said in the title, is the storage space of the primary mailbox and recoverable items, shared ?

Ex: A m365 business basic user with purview retention policy applied, has 50gb primary mailbox space, if they delete a mail the mail will appear in the recoverable items folder, now this retained space is shared with the 50gb primary mailbox storage or nah ?