Well....no. A side slip is used to compensate for crosswind drift, the
aircraft longitudinal axis is parallel to the runway centerline. A forward
slip is used to increase the descent rate, the aircraft nose will be at an
angle to the runway.

It's the same maneuver. The airplane can't tell the difference.
However, the word usage (as above) indicates the purpose of the maneuver.

Jose
--
Get high on gasoline: fly an airplane.
for Email, make the obvious change in the address.