USA Part Compatibility

[caleab]

Hello,

 

This may be an obvious question, but are UK / US engine parts interchangeable? I'm helping a friend with a head gasket change, and I can't seem to find a 1.6L head gasket on rockauto, and I'm not sure where to find a reputable vendor. The websites I've tried have been decent, but nothing I feel confident in buying. He has a 2006 Hatchback, 1.6L, for reference. I would appreciate any advice you could share, as your personal experience means a lot!

 

Thanks,

Caleab