  The correlation between the charge radii differences in mirror nuclei pairs
and the neutron skin thickness has been studied with the so-called finite range
simple effective interaction over a wide mass region. The so far precisely
measured charge radii difference data within their experimental uncertainty
ranges in the 34Ar-34S, 36Ca-36S, 38Ca-38Ar, and 54Ni-54Fe mirror pairs are
used to ascertain an upper limit for the slope parameter of the nuclear
symmetry energy L $\approx$ 100 MeV. This limiting value of L is found to be
consistent with the upper bound of the NICER PSR J0740+6620 constraint at
1$\sigma$ level for the radius R$_{1.4}$ of 1.4 M$_\odot$ neutron stars. The
lower bound of the NICER R$_{1.4}$ data constrains the lower limit of L to
$\approx$ 70 MeV. Within the range for L = 70-100 MeV the tidal deformability
$\Lambda^{1.4}$ constraint, which is extracted from the GW170817 event at
2$\sigma$ level, and the recent PREX-2 and CREX data on the neutron skin
thickness are discussed.
