Mutual Inductance - 7-27-2020

One closed loop of thin wire has the following shape:

$x_1 = \cos \theta_1 \\ y_1 = \sin \theta_1 \\ z_1 = 0$

Another closed loop of thin wire has the following shape:

$x_2 = \cos \theta_2 \\ y_2 = \sin \theta_2 \\ z_2 = 1$

What is the mutual inductance between the two loops?

Note: Magnetic permeability $\mu_0 = 1$
Bonus: If this problem seems familiar or repetitive, try solving it a different way than usual