Deeponinon is a fork of Bitcoin. So you could call it a younger sibling. They did not develop any of the code themselves, just copied and pasted it. Others did that too, like TRON, it flies also high. So it's basically the same code with minor differences.
One is a
POW fair launched coin.
And the other is
POS premined coin with a fake gimmick + fake airdrop and other misc scammy aspects
I would not say they are similar.