Does anyone know if the inner axleshafts are interchanable between Chevy (AAM) 10-bolt front axles and Dana 44 front axles???

I do not recall the exact details, but the spline angles are different. One can slip into the other, but not vice versa. But on the set up that will slip together, the difference in angles lowers the contact area, stressing the splines significantly.

no they are not the same length or spline config.