Yes, this is a good point—If your blazon is "Gules a grayling embowed Argent" then theoretically someone can come along and create a blazon of "Gules a trout embowed Argent." Different arms by blazon, but they would like identical as Martin’s example shows. However, I don’t know what would stop someone from using any type of fish for a blazon that was "Gules a fish embowed Argent."
AFAIK we haven’t formally adopted a "rule" for just how close is too close to avoid duplication or infringement, it’s more like pornography -"I can’t define it but I know it when I see it." 
FWIW my own criteria is that two differently worded blazons that can produce the same image, or two artistically different images that can be described by the same blazon, are the same arms.
As a corollary, charges that are technically different but visually so close as to be practically indistinguishble, should be treated as if they were the same charge. (Essentially Joe’s point.)
Doesn’t mean one can’t use blazonry or images that carry a special meaning e.g. a cant or other allusion, but not where it would result in an image visually indistinguishable from other arms without a biology textbook and a microscope.
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