Does the longer keel have the wing also? If not you may find that the
weight of the wing actually compensates for lack of depth and the C.O.B
(Centre of Balance) is about the same. Although, as mentioned in other
posts, you will most likely find that the shallower keel has less pointing
abilty. It not usually enough to worry about if you arent racing.

Usually the draught keel version of a hull is ballasted more heavily than
the fin keel sister so that the righting moment is the same despite the
shorter lever between centre of bouyancy and centre of gravity. Draught keel
version is therefore also usually a bit slower (even on a reach) because
overall it is a heavier boat.

The higher centre of gravity of a draught keel hull can also sometimes make
for a slightly easier sea motion, because you are closer to the centre of
gravity of the boat than on a fin keeler.