Is there a way in VBA to compare Object References?

Consider the following

Option Explicit
Dim WBArray(1 To 1) As Workbook

Public Sub assign()
Set WBArray(1) = ActiveWorkbook
End Sub

Public Sub test()
If WBArray(1) = ActiveWorkbook Then
MsgBox "Yes"
Else
MsgBox "No"
End If
End Sub

Functionally, I want to make an AddIn with a class module that captures
Application events, but I only want to execute the code for those events on
workbooks that the user has told me are part of my application. So, I was
considering having the user tell me which workbooks are "mine" and in the
event handlers, the first thing I do is check to see if the event causing
workbook is in the list. I was hoping to not have to manage names or other
user definable properties.

Above, in test(), I functionally want to compare the object reference in the
array against the object reference for ActiveWorkbook to see if they refer to
the same object.

Is this something I can do in VBA? (Excel 2003) I could capture the
workbook.name property, and track changes to the name, but I was hoping to
avoid that.

Bob