Why might a bill be passed in the House differ from a Senate bill on the same subject?

A bill passed in the House might differ from a bill passed on the same subject simply because the House and the Senate are run by different members and the bills may thus include different provisions.

Explanation:

Though the processes of introducing a bill are broadly the same in both the chambers of the Congress, the members that frame the bills to introduce in the House and in the Senate are different. The provisions in the bill introduced by a member of the House may not always match with that of the bill introduced by a senator on the same subject.