Gradualism is the view that large-scale changes occurs by the accumulated effects of small changes over long periods of time, rather than by rare cataclysmic events of massive effect.
Uniformitarianism is the view that the same forces that shaped the world in the past continue to operate today. Historically, uniformitarianism has often included aspects of gradualism (i.e. definitions by Lyell), e.g. by assuming uniformity of rates. Uniformitarianism was also originally proposed as the opposite of Catastrophism. However, in modern use, the focus lies on uniformity of processes, and rapid catastrophic changes are allowed under uniformitarianism. Also note that the term Actualism is sometimes used for modern interpretations of uniformitarianism.
If we posited that early evolution occurred by small Lamarckian changes and current evolution occurs by small Darwinian changes, we have a model that is gradualist but not uniformitarian.
If we posited that the earth's topography was formed by meteor impacts and massive tsunamis, in sharp sudden strokes of massive effect, but acknowledged that these same processes occur today, we would have a theory that is uniformitarian but not gradualist.
(I don't understand what you are asking in your last paragraph, or how this relates to your main question.)
