[en] A detailed study of the decay of ⁴⁴Ti and ⁹⁰Ru compound nuclei, via two particle channels involving at least one alpha particle has been performed for the p,α and 2 α channels. This was possible using the combination of the two powerful experimental apparatuses DIAMANT and EUROGAM II. A peculiar behaviour of the energy sharing between the two light particles was found for both systems as a function of the excitation energy in the residual nuclei. Notably, the proton energies are almost independent of the residual nucleus excitation energies E_f while the alpha particle energies decrease when the E_f rises. This experimental results obtained for the first time in exclusive measurements were confirmed also in simulations. It was shown that the implied particles in the compound nucleus decay do not play the same role in the energy sharing. In the case of ⁹⁰Ru a strong correlation between the residual nucleus excitation energy and its angular momentum was observed