Changing Ragdolls

Is there a way to change a ragdolls physics with another ragdoll without using a program?

yup…you must only change the .phy file
But it work only for the models is Playermodels

Locate the model in Garrysmod’s file structure
Take .phy file
Rename and replace with second model’s .phy file

would it work on insurgency mod ragdolls?

Probably, but I don’t think they use the same skeleton. (Don’t know if it matters)