Minecraft Texture Pack help - Block texture based on name

Question

I want to make custom block textures and use those in a Map, but i don't know if it's possible. Does anyone know anything about this?

For example, using NBT tags, i make a custom texture for a block (for this, i made a lapis block green). However, i don't always want it green. I want it to be green ONLY when it's named something specific, like this:

Lapis block - No name, blue texture
Lapis block - Name: Emerald block, green texture

Is this possible? I have Optifine 1.12.2, for more information. Any help would be very appreciated.

(Also i can't go above 1.12.2 'cause my pc will crash from the 5 fps)