Answer
At the center of the wells, the probability density for the proton is equal to that of the electron.
Work Step by Step
We an write an expression for the probability density at $x$ for a particle in a potential well:
$\psi_n^2 (x) = \frac{2}{L}~sin^2~(\frac{n\pi}{L}~x)$
We can see that the probability density depends on $n$ and $L$ but it does not depend on the mass of the particle.
Therefore, at the center of the wells, the probability density for the proton is equal to that of the electron.
