Lucas coil question

[Mark Gendron <markge@MICROSOFT.com>]

Some years ago, I found a NOS Lucas coil that looks just like the original
TR2 coil 
as pictured in the workshop manual. It has the high "tower" for the HT lead,
it uses 
the HT lead with the round metal plate on the end for the contact, etc.
However, the 
Lucas number cross-referenced to a Cadillac Allard. 

Does anyone have any idea how it would differ from the TR2 coil, and whether
there 
would be a reason to not use it with a TR2?