(Pardon me if this isn't the right place to post these questions)

I recently discovered the joy of Netflix and it's even more sweet as a Dane (my goodness, so much tv *drool*) and now I want the luxury of being able to use it via my iPhone. I've gone ahead of myself and bought a giftcard for the US iTunes Store (since Netflix and the Netflix App isn't available in Denmark) before I was certain if it was even doable.
There are some simple workarounds to use the US store but now I'm wondering if I'll be able to use apps bought on a diff account than the one my phone is associated with?

TL;DR: Can I use apps bought in the US iTunes Store on a Danish account or am I screwed?

Thank you kindly in advance