Yeah, for models they mean the same thing. Lawyers and english teachers would diferentiate the terms based on what Lnewqban wrote....
(just pulling your leg Lnewqban
Technically a sailplane is an aircraft designed and intended to ride the air currents and maintain or gain height and flying time by using this free energy. A "glider" would be more like the troop gliders such as used in WW2. Some folks will also call the short and stubby training craft such as the Schweizer 2-22 a "glider" but refer to some other two seaters as "sailplanes".