Is the steerng knuckle on a 1981 300SD interchangeable with later W126 cars?

[otto huber]

I have a torn boot on the passenger side lower ball joint. I plan on replacing it in the next month or so, and would like to pull a steering knuckle out of junk yard, and take the knuckle to a shop and have them press in a new ball joint so that I can do the job at my convenience. My 300SD is my daily driver and only car, so this would make things easier for me. Thanks