The Canon EF 28-90mm f/4-5.6 II Lens is basically the same lens as the
Canon EF 28-90mm II USM Lens.
The exception is that it utilizes MM (Micro Motor) in lieu of
Micro-USM (Ultrasonic Motor) for autofocus.
The realized difference between these two lenses is that the Micro-USM version will focus
a little faster and a little more quietly.
And the non-USM Canon EF 28-90mm f/4-5.6 II Lens costs less.
Otherwise, read the
Canon EF 28-90mm II USM Lens Review
to see what else you get (or don't get) with the Canon EF 28-90mm f/4-5.6 II Lens.