Erik, Embarrassing for me, I’m using several versions of DIN. The article (when viewed on our website) is set in DIN Offc. Most of the samples are set in FF DIN as you suspected, but I use *another foundries* cut of DIN for some of the numerals. Specifically the non-lining numerals.
I probably should have specified, but I didn’t want the article to become 10,000 words. The differences between the various DIN drawings should be the subject of another article written by someone more qualified.