...Why not just assume the table definitions are different...
in reply to Re: Automatically altering tables from different schema's
in thread Automatically altering tables from different schema's
I would let that be up to the developer: either she uses the current table definition, as retrieved from the database, as the "original", or an "original" definition that was stored somewhere else.
The latter would allow you to keep hidden fields in a table, invisible from your application. This could be handy if you have two "views" on the same table.