Final answer:
If both chambers pass a bill with different wording, it is sent to a conference committee to reconcile the differences and create a unified version that both chambers can agree upon.
Step-by-step explanation:
When both chambers of Congress pass a bill but with different verbiage, they send the bill to a conference committee to iron out the differences. The conference committee is a temporary panel composed of House and Senate conferees whose purpose is to reconcile differences in legislation. This committee negotiates a compromise version of the bill which then must be accepted by both chambers without further amendment before it is sent to the president. Bills that cannot be reconciled by the original chambers often go through this process to achieve a final unified version. An example of major legislation that went through this process is the Tax Cuts and Jobs Act of 2017.
If the president vetoes the reconciled bill, it requires a two-thirds vote in both chambers to override the veto and enact the bill into law.