How to estimate the system impulsive response via Fourier transferm?

A common signal x1 input to both system1 (impulsive response h1) and system2 (impulsive response h2), I want to equalize the output of system2 so that the ultimate output is just like what comes from system1. The equalization system noted as h3. Just like the figure attached.

in theory, h3 =ifft( (fft(h1))./(fft(h2)) );

h2_3= filter(h3,1,h2); plot([h1 h2_3])

the plotted figure shows h1 and the equalized system h2_3, but they donnot look like each other. I'm not sure the exact reason.

Thanks for any response.

Deming