Strictly speaking, a contest for the Beginner Kit should use only parts from that kit. This is like a 3rd grade math competition should not allow the use of 5th grade methods. But the theme may have been expanded to include any kits, which is fine too if clearly stated so.
There are still 17 days left in the contest, so if one can order the kit now and get it in the next few days it may still be doable. It will be helpful if @MakerWorld can clarify.
I saw that one can get the Beginner Kit for 110 points. But I am more interested in the Essential Kit which also has a good deal going on right now. If models that use the Essential Kit can be in then I may want to get the Essential Kit instead of the Beginner Kit.
