  It is well-known that Einstein's equations constrain only the total
energy-momentum tensor of the cosmic substratum, without specifying the
characteristics of its individual constituents. Consequently, cosmological
models featuring distinct decompositions within the dark sector, while sharing
identical values for the sum of dark components' energy-momentum tensor, remain
indistinguishable when assessed through observables based on distance
measurements. Notably, it has been already demonstrated that cosmological
models with dynamical descriptions of dark energy, characterized by a
time-dependent equation of state (EoS), can always be mapped into a model
featuring a decaying vacuum ($w=-1$) coupled with dark matter. We explore the
possibility of breaking this degeneracy by using measurements of the gas mass
fraction observed in massive and relaxed galaxy clusters. This data is
particularly interesting for this purpose because it isolates the matter
contribution, possibly allowing the degeneracy breaking. We study the
particular case of the $w$CDM model with its interactive counterpart. We
compare the results obtained from both descriptions with a non-parametric
analysis obtained through Gaussian Process. Even though the degeneracy may be
broken from the theoretical point of view, we find that current gas mass
fraction data seems to be insufficient for a final conclusion about which
approach is favored, even when combined with SNIa, BAO and CMB.
