The present work reports the effects Mn site doping on the structural, magnetic and magnetotransport properties of Nd0.67Sr0.33Mn0.9T0.1O3, where T = Mn, Fe, Cr and Ni. Structural analysis based on Rietveld refinement confirms that the samples crystallize in orthorhombic structure with Pbnm space group. A detailed investigation on the FTIR spectra hints to the improved metallic character of Nd0.67Sr0.33Mn0.9Mn0.1O3 and Nd0.67Sr0.33Mn0.9Ni0.1O3 samples. Strong ferromagnetic character of Nd0.67Sr0.33Mn0.9Mn0.1O3 and Nd0.67Sr0.33Mn0.9Cr0.1O3 is revealed from ZFC-FC magnetization studies, while the Fe and Ni doped samples possess strong AFM ground state. An irreversible metamagnetic transition is discernible from the hysteresis curve of Nd0.67Sr0.33Mn0.9Fe0.1O3. Transport studies reveal a charge ordered state in Fe doped sample close to its spin glass transition temperature, Tg = 65 K. Nd0.67Sr0.33Mn0.9Mn0.1O3 behave like a typical double exchange material with nearly same TC and TP values, whereas for all other samples TP lie much below TC. Low resistive state materialized in a strong AFM material as observed in Nd0.67Sr0.33Mn0.9Ni0.1O3, is rarely observed in manganites. Colossal MR values exhibited by Fe and Ni doped samples are understood based on phase separation scenario of manganites. Large dissimilarities evident in the magnetic and electronic properties of the compounds, though the dopant ions possess nearly same ionic size, are attributed to differences in their electronic configuration. Resistivity behavior of samples in different temperature regimes are comprehended based on existing models of conduction.