For final info I'd contact Kodak @ 800.242.2424x60. However, I've cross 
processed since 1966 on E-4 through E-6 and never had a single problem. 
Problems arise with careless times/temps/agitation. ALWAYS though, I have 
kept the films separate when doing so. Since you are on a line and it is 
constantly replenished I do not think you'd find any overall changes.
An interesting one to try is Kodak's Infra-Red color. It needs an E-$ 
process but you can do it in E-6 w/a lowered temp and extended times. 
Makes a great print of strange colors on standard chromagenic papers.
jack Fulton
                     ***The eye is the Pencil of Nurture***