Lets say I have a simple cube and a sphere, is their a way I can make the cubes mesh node match that of the sphere in python? Similar to the Modify --> Replace method. I have tried cmds.nodeCast but I dont want to switch them. Just to copy exactly from the other.
If you're ok with instances then you can select both objects and run this:
import maya.cmds as cmds
sel = cmds.ls(sl=True)
cmds.connectAttr(sel[0] + ".outMesh", sel[1] + ".inMesh", force=True)