  We study the global agreement between the most recent observations of the
Cosmic Microwave Background temperature and polarization anisotropies angular
power spectra released by the Atacama Cosmology Telescope and the Planck
satellite in various cosmological models that differ by the inclusion of
different combinations of additional parameters. By using the Suspiciousness
statistic, we show that the global "CMB tension" between the two experiments,
quantified at the Gaussian equivalent level of $\sim 2.5\,\sigma$ within the
baseline $\Lambda$CDM, is reduced at the level of $1.8\sigma$ when the
effective number of relativistic particles ($N_{\rm eff}$) is significantly
less than the standard value, while it ranges between $2.3\,\sigma$ and
$3.5\,\sigma$ in all the other extended models.
