While it is possible for a yard to have varying pH levels, it is unlikely to have widely varying levels. Your added soil on top could have a different pH but, as worms etc. mix the two layers over time, the pH would tend to move to the prevailing pH of the underlying soil. Laurel Leaf Willow in my references is shown as tolerant of both mildy acidic and mildly alkaline soil so pH is likely to be less of an issue than the fact that it likes wet soil - is your soil wet?
However, it is always useful to know what your soil pH is so it wouldn't hurt to have it tested anyway....
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