It’s not just a matter of Shadowless vs Unlimited.
To answer your question @pokeretro , yes, some Base Set holos have a “matte” holo that doesn’t really sparkle.
It should also be pointed out that all holos vary to some extent in terms of how sparkly they are, just like there is a range in colors print (not just Shadowless vs Unlimited for which the difference in colors is clear as day, but even within Shadowless and Unlimited there is a range).
As stated above they are both printed differently from different sets. The right one is a reprint of the left one, where they changed color patterns and layout completely