  We report superconductivity in polycrystalline samples of the 1038-type
compounds (Ca$_{1-x}$RE$_x$)$_{10}$(FeAs)$_{10}$(Pt$_3$As$_8$) up to T$_c$ = 35
K with RE = Y, La-Nd, Sm, Gd-Lu. The critical temperatures are independent of
the trivalent rare earth element used, yielding an universal T$_c$($x$) phase
diagram for electron doping in all these systems. The absence of
superconductivity in Eu$^{2+}$ doped samples, as well as the close resemblance
of (Ca$_{1-x}$RE$_x$)$_{10}$(FeAs)$_{10}$(Pt$_3$As$_8$) to the 1048 compound
substantiate that the electron doping scenario in the RE-1038 and 1048 phases
is completely analogous to other iron-based superconductors with simpler
crystal structures.
