Unfortunately, the short answer is "no".
An email address can only be associated with one VCG account or user, and can not be associated with any other account or user. The simple reason (which actually isn't really all that simple), is that our software associates the email address as a unique identifier for managing the "behind the scenes" services associated with the account.
If you have multiple locations for your business, each of these locations must have a unique email address associated with it as the account owner. Some of our clients have decided to setup a unique email address for multiple locations using the location in the naming convention of their email address.
You can, however, have the same password if you'd like.