In this work, deformation mechanism maps are presented for four slightly different complex polycrystalline CoNiCr-base superalloys. Despite the chemical differences, the dominant deformation mechanism in all of these alloys transitions from shearing by APB-coupled dislocation pairs to shearing under superlattice stacking fault formation with increasing temperatures and/or decreasing strain-rate. Additionally, microtwinning is observed at even higher temperatures and/or lower strain-rates but only in the alloys, in which Al and W are substituted for Ti and Ta. The influence of segregation processes and the role of small compositional changes on the occurring deformation mechanisms are analyzed and discussed.