Note. The radial velocity measurements provided here are corrected to the heliocentric velocity (Δν_h = −1.6 km s⁻¹). The correction was calculated with the IRAF task rvcorrect with the observatory set to LCO, for the observing time and coordinates of both targets. We note that the radial velocity measurement differences seen on different lines are due to the wavelenght solution is not linear and thus values differ significantly more than the uncertainties. Therefore focusing on the measured velocity difference between the clusters leaves generally the relative values untouched while individual velocity measurements carry this systematic uncertainty in their values. Moreover, due to the data reduction, each row of the straighten slit was independently wavelength calibrate, therefore the differences are amplified during the spectra addition, this systematic error is represented in the fifth column and corresponds to the final rms.