It's actually kinda odd that celius also uses degree when all other metric measuring standards just use the name of the standard. (Eg. Meter, grams, litres). Degree doesn't imply metric at all. It would be more useful to just say "20 Celcius" rather than "20 degrees".
Failheit, Celsius, and Kelvin all use degrees. Think of it like different standards of degrees. Just like there is US Customary gallon and Imperial gallon (they are not the same).