Are the graphics supposed to be in the exact same place/page in all of the documents so that you're dealing with a "black only" plate change? If so, one thing to keep in mind is that some languages are more complex than English and copy may run longer than the English version. For example, we print both English and Spanish versions of materials for a large burger chain and a lot of the time copy runs longer in the Spanish version then in the English version. Where this is a problem is when a graphic has to be put on a page where the copy references the graphic. What I mean to say is that suppose on page 12 of an English document there is copy that says "see figure 10" on the page and the graphic is on that page. When the Spanish version comes in the language is more complex and the "see figure 10" may have been bumped to page 14 just because the text is longer because it is Spanish, so naturally, the graphic now has to be on page 14 instead of 12 and that throws the "black only" plate change right out the window.
By the time I walk out of here, I'm going to be a lean, mean, prepress machine...