VariatedOres is a pack that makes all ores adapt to the blocks around them using Optifine!
When ores generate next to veins of Andesite, Diorite, or Granite (or blackstone in the case of nether ores) they will be given a new appearance. In some cases, this may make them easier to spot, but in others it will make they a lot more challenging to locate.
This pack will be updated for 1.17 to include copper ore, as well as dripstone and deepstone (and any other variants of stone we haven't seen yet!)
What is Stay True? Is that the name of another resource pack? If its the name of another resource pack, the answer will generally be no since it would require having to gain permission from the artist of the other pack to use their textures, as it would require the modification and redistribution of said textures.
Yeah, this pack works in a way so that if you have Optifine's Connected Textures feature enabled, any ores that are placed next to Andesite, Diorite, or Granite (or blackstone for nether ores) the ores will take the appearance of the stone it is next to.
Yeah I did notice that the blackstone nether gold looks a lot like gilded blackstone haha. At one point I considered using the gilded blackstone texture for it, but I decided against it.