There are many common elements between Book 7 and Isaiah 7. Maybe one day I'll start a thread on it. You have noticed several links already.
The last one you point to is specially striking. The phrase "two tails" appears only in the two passages above! (Had you noticed that? ) This is a high level link that strengthens the Isaiah-Bible Correlation.
And it gets better yet. The word for "tail" in both passages is Zanab, which begins with the seventh letter Zayin!