If I understand correctly your question, the answer is definitely no.
Think about the typical physical representation of the concept of "rate of change": the velocity is the rate of change of position, right? And there's no difficulty in imagining a non-constant velocity, as when you accelerate or decelerate..
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Unit rate, slope, and rate of change are different names for the same thing. Unit rates and slopes (if they are constant) are the same thing as a constant rate of change.
a constant ex: Pi. it will always be 3.14159... it will never change in value.
A value that does not change is a constant.
A linear relationship.
A fraction is a numerical constant. Being a fraction does not alter that. And, as a constant, its rate of change is precisely zero.