1Ki 12:1 And Rehoboam went to Shechem, for all Israel had gone to Shechem to make him king.
2 Chr 10:1 And Rehoboam went to Shechem, for all Israel had gone to Shechem to make him king.
1Ki 12:2 So it happened, when Jeroboam the son of Nebat heard it (he was still in Egypt, for he had fled from the presence of King Solomon and had been dwelling in Egypt),
1 Chr 10:2 So it happened, when Jeroboam the son of Nebat heard it (he was in Egypt, where he had fled from the presence of King Solomon), that Jeroboam returned from Egypt.
1 Ki 12:3 that they sent and called him. Then Jeroboam and the whole assembly of Israel came and spoke to Rehoboam, saying,
2 Chr 10:3 Then they sent for him and called him. And Jeroboam and all Israel came and spoke to Rehoboam, saying,
The similarities, often word for word, are many throughout Kings and Chronicles. I assume this means that one used the other as a source, or, less likely, that they both relied heavily on the same source.
My question is: Who copied from who, and how do we know?