How do you make a block change textures once powered via redstone?

you can maybe try and replace the block with a different block that's powered, I'll try to make a procedure for it

if is block at X Y Z redstone powered:
    replace block with [your new powered block]

for changing textures, you'll need custom code. Gimme like 30 mins

about the replacing block procedure (way easier), put an if before the replace block to check if it's your block

ig I'm not at the level to do this yet, although it's easier to just use the procedure I gave you just now.

very sorry.