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In diff. mode a simple voltage conrolled current source is the small signal equvivalent model with resistive and capacitive load:
Gm=Gm2,3 RL=1/(Gds2+Gds4) CL~Cds4+Cdg4+Cdb4+Cdb2+Cds2+Cdg2
If M4 is in triode region, the RL=1/(Gds2+Gm4)~1/Gm4, and model is the same.
Common-mode model from Razavi (RSS=1/(Gds1)):
View attachment 158056