Arrive at Beijing Capital Airport T2 from Seoul (Korean Air) and leave from T3 to Copenhagen (SAS).

Will I have to pick up my suitcase and go through customs at T2? And how do I transfer from T2 to T3?
I understand that I will not need a visa, since the onwards flight departs less than 24 hours (4:20 hours) after arrival (I'm Norwegian)?
Will 4:20 hours be enough time for transfer from T2 to T3?
Thank you!