I guess my exposure question was for the sake of comparing the characteristics of the developer, while minimzing variables.
For instance, let's imagine we have a negative in our enlarger and we expose to prints for 10 seconds onto a b&w paper that can both "lith" & print "straight" well. Then put one in a paper developer and the other in a lith.
Based off what little I know of developer chemistry, and what you've told me about lith developers, it seems that if this exposure produced a good straight print, the lith would be overexposed.
But yes, I'm sure using a dedicated lith film changes things a bit as well. I'll look for that book next time I'm at la biblioteca.