Do the electric and magnetic fields of a light ray have the same amplitude and frequency?

When looking at a diagram of the electric and magnetic fields oscillating down the time axis of a light ray diagram the field amplitude and frequency of each component is shown equal. Are they in fact equal in both respects?

In general, if you have a travelling wave at some frequency $f$, then both the electric and magnetic fields will oscillate at that same frequency.
On the other hand, even if the amplitudes $E_0$ and $B_0$ cannot be compared, one thing you can do is compare the relative amount of energy stored in the electric and magnetic field oscillations, given by $\frac{\varepsilon_0}2E_0^2$ and $\frac{1}{2\mu_0}B_0^2$, respectively, and here it's easy to see that regardless of the system of units both components, magnetic and electric, carry exactly equal amounts of energy, at least for a plane wave.