(beginner) calculating orientation change with eulers

[astull]

I don't mean to be a bother but the modified script still yields a non-unique solution. For example, both of the following sets of eulers yield the same solution:

euler1 = [30,90,0]
euler2 = [0,0,0]

euler1 = [0,90,30]
euler2 = [0,0,0]

solution: (90, 90, 30)

I don't understand why this happens. Maybe the vector/rotation alternative may be a more practical solution.

Thank you again for your help!