Is there a way to disable DU ore generation so that i can use
https://www.curseforge.com/minecraft/mc-mods/realistic-ore-veins
to spawn the ores?

Or, fix them.

One generation must be disabled on mods that are generating the ores. Like, you want to disable the Immersive Engineering ores you disable them in their configs.

Kinda dumb. The wrapper ores are invisible and the models are invalid. Seriously, install cofh and thermalfoundation and look at platinum. You wont see it, but you can bump into it. Placing it in creative shows a missing texture while the real ore works just fine.

Please add an option to disable your ore wrappers. They arent reliable.