œ vs. ǿ

Hi.

I'm sort of a beginner in learning the old norse language, so this is my first mail to this group.

I have noticed that my dictionary uses an ø with an acute accent (ǿ) where the course would use œ (not æ) or oe. For example in the verb 'fœra'.

As a norwegian it lies much closer to my natural handwriting to use an ǿ than an œ, so my question is therefore if these two letters are interchangeable in old norse?

Thanks in advance
Tobias