  This paper discusses if large scale galaxy distribution samples containing
almost one million objects can be characterized as fractal systems. The
analysis performed by Teles et al. (2021; arXiv:2012.07164) on the UltraVISTA
DR1 survey is extended here to the SPLASH and COSMOS2015 catalogs, hence adding
750k new galaxies with measured redshifts to the studied samples. The standard
$\Lambda$CDM cosmology having $H_0=(70\pm5)$ km/s/Mpc and number density tools
required for describing these galaxy distributions as single fractal systems
with dimension $D$ are adopted. We use the luminosity distance $d_L$, redshift
distance $d_z$ and galaxy area distance (transverse comoving distance) $d_G$ as
relativistic distance definitions to derive galaxy number densities in the
redshift interval $0.1\le z\le4$ at volume limited subsamples defined by
absolute magnitudes in the K-band. Similar to the findings of Teles et al.
(2021; arXiv:2012.07164), the results show two consecutive redshift scales
where galaxy distribution data behave as single fractal structures. For $z<1$
we found $D=1.00\pm0.12$ for the SPLASH galaxies, and $D=1,39\pm0.19$ for the
COSMOS2015. For $1\le z\le4$ we respectively found $D=0.83^{+0.36}_{-0.37}$ and
$D=0.54^{+0.27}_{-0.26}$. These results were verified to be robust under the
assumed Hubble constant uncertainty. Calculations considering blue and red
galaxies subsamples in both surveys showed that the fractal dimensions of blue
galaxies as basically unchanged, but the ones for the red galaxies changed
mostly to smaller values, meaning that $D$ may be seen as a more intrinsic
property of the distribution of objects in the Universe, therefore allowing for
the fractal dimension to be used as a tool to study different populations of
galaxies. All results confirm the decades old theoretical prediction of a
decrease in the fractal dimension for $z>1$.
