Apple's AC Cords for MagSafe (1+2) always the same?

I am getting a customised MacBook Pro Retina and it will have a AC Cord for Britain, but I need one for EU/Germany.

So can I easily switch the AC Cord of my MagSafe 2 to a German one? Are these Cords somehow patented or normed, so I can use every cord on any adapter?

Also: Where am I able to buy a Apple-original AC Cord (not the whole adapter)?

– Steve