In case there isn't a better solution...
Problem (for anyone else looking in):
-Your Newton simulation is in a chor and it's a set of pieces, each of which is its own model. The model bone for each piece is what is animated and gets keyframed.
-You can import that into a new chor but apparently can't move all the animation.
My idea...
- import your sim Chor and leave it at 0,0,0
-make a new model (We'll call it "Fred") that has as many bones as your Newton sim has model bones.
-constrain each Fred bone to a Newton model bone.
-bake the Fred bones
-remove the constraints and do the reverse... constrain each Newton model to its corresponding baked Fred bone
- Now you can move the model bone for Fred and the Newton pieces will follow, with their animation too.