Intermediate Financial Accounting

1. With regard to the correction of accounting errors, what is the difference between U.S. GAAP and IFRS?

2, For financial reporting, a reporting entity can be a single company, or it can be a group of companies that reports a single set of financial statements. When changes occur that cause the financial statements to be those of a different reporting entity, we account for the situation as a change in reporting entity. What are the situations deemed to constitute a change in reporting entity?