LUN8 and 8TURN have a lot in common

... and it's difficult not to mix them up

Other than the obvious 8 in both names, and 8 members in each group:

both groups have members that were on I-LAND - 8TURN Kyungmin, LUN8 Ian (Sungchul)

both groups have labelmates who were in IOI (8TURN - Chungha, LUN8 - Yoojung and Doyeon of Weki Meki)