When setting up a skeleton in the HumanIK window, you can export a template of the joint positioning, then re-use that template to build other similar skeletons.
To export a HumanIK skeleton template file
The global translation data for the joints is saved as a text file in the location you selected in the Export Template window.
To import a HumanIK skeleton template file
The skeleton that you created or loaded updates to use the joint positions from the template file.