For the life of me I can't find any difference between these three versions of EF/SG's Europa Grotesk, Europa Grotesk No. 1, and Europa Grotesk No. 2, other than stroke thicknesses. Any help? Each version seems to be a modest variation on Akzidenz Grotesk, AG Old Face, and/or Helvetica. This does not concern the headline vs. text versions of their fonts, so I link to just the SH versions of them below.
http://www.myfonts.com/fonts/efscangraphic/europa-grotesk-sh/dem-bol/
http://www.myfonts.com/fonts/efscangraphic/europa-grotesk-no-1-sh/med/
http://www.myfonts.com/fonts/efscangraphic/europa-grotesk-no-2-sh/bol/