If they have the same white paper, then they are the same coins, and why should care about the coin plagiarism andnow about the whitepaper. For example, you think BTC and BCH should have a different whitepaper? They only have a different block size, but is the same thing.

But at end coins are open source, any one can take a coin, create a genesis block and launch his coin, take the idea from internet and post it on the same internet, that's why we see now days all those alts and icos.