The switch from yoke to DIN is a conversion where you remove the yoke fitting from the first stage housing and replace it with the DIN fitting. This hardware is "manufacturer and model specific."
Now, once you have your reg converted for DIN, you can mount a univeral DIN-to-Yoke adapter on the DIN fitting if you like, but it's sort of bulky and awkward and not nearly as streamlined as the original yoke fitting.
I do the conversion both ways when I want to move a reg from yoke to DIN or vice-versa.
Clear? (as mud, right?)
I'll try to get some pictures if you like.
Rick