  As recently pointed out in Ref. [Phys.\ Rev.\ D {\bf 96}, 8, 083502 (2017)]
the evolution of the linear matter perturbations in nonadiabatic dynamical dark
energy models is almost indistinguishable (quasi-degenerated) to the standard
$\Lambda$CDM scenario. In this work we extend this analysis to CMB observables
in particular the integrated Sachs-Wolfe effect and its cross-correlation with
large scale structure. We find that this feature persists for such CMB related
observable reinforcing that new probes and analysis are necessary to reveal the
nonadiabatic features in the dark energy sector.

Cosmology and Nongalactic Astrophysics;General Relativity and Quantum Cosmology