I think that they may have similar themes, but not similarties between the smell. Both have some which is woody, dry, but still have a dose of sweet notes. In M7, i have an impression that what makes the syrup-wood accord is the amber and musks at the base, combined to the woody oud note. Tom Ford Extreme has more of something party sweet fruit, part dry fruit at the opening, rich reminds me of plum, but which develops to a woody base with something leathery. Tom Ford Extreme, tough, is too light and didn`t lasted me more than 6 hours, while M7, even in the recent version, was intenser and lasted more than it.