Both series contains romantic comedy themes involving the supernatural theme of body switching.
They also feature a similar setting take place at school with comedy and drama. The main character in both series also gets caught up with mange strange circumstances around his friends.
Both series' main female protagonist also has a haughty personality.
A mysterious sensei with powers conducts an experiment. Romance and shenanigans ensue. Uwagaki is like the more comedic version version of Kokoro Connect ( Kokoro Connect still has it's comedic moments though).