Questions about Lehner 19 series

[Scoob]

What are the sizes of the 19 motors comparable to? I assume they are all the same diameter with longer can as they go up from 1920 to 1930, 1940, ect. What is the diameter compared to other BL motors, 380, 540?

How do they compare in size class to the Feigao motors? Just from looking at the pics, it looks like the 1920 = 540s, 1930 = 540l, 1940 = 540xl. Isn't there a 15 series as well, I would assume they are 380 class?

Thanks. I'm just trying to understand the Lehner and considering buying a couple.