I think they're meant to be effectively the same filters, except they're balanced to give 1:1:1 RGB combine ratios for G2V stars (not including any atmospheric extinction effects) depending upon which sensor you're using.
The Astrodon website provides a good summary:
http://www.astrodon.com/products/filters/e-series/
http://www.astrodon.com/products/filters/i-series/