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Top one is C. elegans, lower one is festivum. You can see the difference in abdominal pattern, but there are related species to be aware of.
C. festivum has continuous black beading around the sides of the abdomen, and all yellow femora. The bars are also a characteristic shape.
C. elegans has yellow on the lateral margins of the abdomen, antennal segments 1 and 2 equal in length, and 3 equal to 1 and 2 together.
Hope this helps!