This is something that's never really caught my attention until Linkus pointed it out. Assuming that is a modified version of the spring palette in the Oracle series, lets evaluate the differences of the actual palette, and the EZGBZ palette.

Actual Palette:


EZGBZ's Version:


Notice how high in contrast the EZGBZ version is to that of the original? May not seem that big of a deal, but wasn't the purpose of that tileset to be a complete rip of palettes, tiles, and sprites of the gameboy Zelda mini series?