They likely have the same oreDic tag and will be unificated when dropping. I can blacklist them so it does not happen anymore, i just need their oredic entry for that.
The oreDic for the shards:
dyeLimeCrystalShard (Lime being the color, changes depending on what color the shard is)
shardCrystal
dye
The oreDic for the cave crystals:
dyeLimeCrystal (same as above)
dyeCrystal
caveCrystal
dye
All the possible colors are:
Black
Red
Green
Brown
Blue
Purple
Cyan
LightGray
Gray
Pink
Lime
Yellow
LightBlue
Magenta
Orange
White
At least I think that's what you're looking for. I attached an image of where I got this from just to be sure.