Diode capacitance and Drain to Source capacitance in function of the frequency
Just look in the respective data sheets: -


I do not know how the capacitor into the diode and the MOSFET evolve in
function of the frequency

You can rely on the capacitance values above for up to 1 MHz but gradually, as frequency rises you will get inductive properties of the devices coming into play and the data sheets are pretty lean in this respect.
As usual, my best advice is get models of them both and do some simulations.

I would like to determine the two parallel capacitances for each
components at a frequency around 50 kHz - 100 KHz.

I believe you can trust the above graphs at those frequencies. The MOSFET appears to have lower capacitance than the diode.