Potentially yes -- though it depends on just how dense the combined wood & composites in your blade really are, where they are located, and what frequency range they're vibrating at.
To clarify -- To control vibration, what you actually want is
a big difference in average density between the handle scales, and the rest of the blade's wood sandwich on the whole.
Dense handle scales are a great way to achieve a big density difference, but it only works when the average density of the rest of the blade itself is comparatively low (and most of the time, it is).
If however you happen to have a particularly heavy and/or dense blade sandwich, that's when you typically want
light and low density handle scales instead (...or else a truly SUPER hard and dense handle wood like Ipe, Mulga, or Gidgee.... but that will also make your blade weigh a proverbial ton!)
Basically, the bigger the average density difference between handle scales and blade, the harder it is for vibrations to pass from the blade through the handle to your hand.
Probably best to send me a PM on TTD if you want to know more about what causes the issue in your blade, and how best to fix it... (don't want to derail the thread
)