H&M Accounting and Exposures

If an investor wants to compare the financial results of The
Gap, inditex, and H&M what difference does it make that their financial
statements are prepared according to different GAAP? Would you expect there to
be a big difference between US GAAP as used by the The Gap and IFRS as used by
H&M and inditex? 

What are the major sources of influences on H&M
accounting standards and practices?

What type of exposure could the CFO of H&M in the US be
subjected to since H&M is based in Sweden and the financial statements are
prepared according to IFRS? (IASB? Maybe?)

Payments and liabilities may also be subjected to exposure.
Explain the operational hedging strategies that may offset exposure