(I don't see why award tickets should be different than other tickets.)
Ski bag = one piece = the same as bag
Snow ski and golf equipment
Even if skis & golf equipment exceed the general baggage dimension of max 158 cm, it may be considered one ”regular piece” and may be included in the free baggage allowance.
If exceeding the free baggage allowance a flat rate applies for Snow Ski and Golf equipment.
Domestic DK/NO/SE Within Europe Between Europe and Asia/USA
Snow ski equipment, max 12kg/26lbs. € 20 € 30 € 40
But you are EBS, right? So you should have two "bags" (bag and/or skis) free on SK/KF.
More baggage for EuroBonus members
As a EuroBonus Gold- or Silver member you can always check in one extra piece of baggage free of charge. The allowable weight of this extra piece depends on the ticket type you are traveling on.