If your question is "Does pronunciation matter in the specific example I cited?" then the answer is evidently no. If you actually meant to ask if it matters in general, then obviously the answer is yes. English in particular seems to be pretty troublesome when it comes to pronunciation, and if you arbitrarily mispronounced every word in a sentence there would be little chance of successful (or, at the very least, clear) communication.
You certainly seem preoccupied with pronunciation, though, considering you don't seem to think it matters.