The beige one with the oval 'Zoll' license palte in the main pic is a 180 or 190 ([W120], or [W121] if it's a diesel) indeed. I don't think it's possible to see the difference between these two options. The open roof became available on the 180 in 1957, but maybe the 190 had it already in 1956.
The grey one in the thumbnail is a 6-cylinder model (different indicators): 1956+ 219 [W105] or 1954+ 220 (S) [W180] or 1958+ 220 SE [W128]...