They have always denied that there is any relation when they were asked on Telegram.
That doesn't necessarily mean they don't share the same ownership. Their Telegram staff has given wrong answers before, like when they said BFG would be released as a TRC-20 token. Another coincidence besides the UI is that they both registered their domain with GoDaddy and use Cloudflare as their DNS provider. If you look at the next biggest DEXs, Pancakeswap, Uniswap, Sushi, Lavacake, and Polycat, none of them use the same registrar + DNS combo as BetFury.
It could be the possible lack of information sharing. Previously I asked about this and the support rep told me she had no idea on the token protocol (TRC or BSC), which then happened turned out to be the latter days later.
In the end, even if both are from the same developer/ team, no point we further escalate this. After all, they allow players to trade their tokens as well as earn from staking.