Colossal magnetoresistance (CMR) and nm-scale electronic inhomogeneity close to the first order phase transition in perovskite manganites, e.g., (La(1-y)Pr(y))0.67Ca0.33MnO3 still remain a puzzling phenomenon. We experimentally model a metal-insulator phase coexistence by growing a short period ((LCMOn)/(PCMOn))m superlattices (SLs) with the same thickness for both components. CMR effect was studied as a function of the individual layer thickness n=2–8 u.c. and then compared with chemically homogeneous (La(1-y)Pr(y))0.67Ca0.33MnO3 LPCMO films. We show that SLs can be superimposed in the phase diagram of LPCMO. The results also point out the importance of the nm-scale electronic rather than chemical separation for realization of the CMR effect as well as limits the lowest boundary for the thickness of an individual manganite material to n~4u.c.