Suppose \( f(x) = x^4 + ax^2 + bx \) satisfies the following two conditions:

\[ \lim_{x \to 2} \frac{f(x)-f(2)}{x-2} = 4,\quad \lim_{x \to 1} \frac{f(x)-f(1)}{x^2-1} = 9.\ \]

What is the value of \( b - a \)?

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