In my opinion, Abe 01 brings up a good point. Grubbs and Mudokons are worrying similar. The reason OWI created a new cast of characters was so that the story he wanted to tell wouldn't interfere with the fans' expectations of existing characters. That is to say, the Grubbs are militant, quite determined and get pretty bloodthirsty at the height of their war. The Mudokons are disorganised, lazy and passive.
Their similar designs are probably a result of OWI trying to express the same ideas through them: the green skin symbolises closeness with nature; the large eyes give the impression of innocence; and so on.
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