Yeah they're totally separate games. I don't think the Dinohazard devs had even ever heard of Dino Hazard. The name is clearly just a homage to Dino Crisis and Biohazard.
Glad I'm not the only one who got contacted. The scumbag is throwing around his trademark notice and he doesn't even have one: https://www.trademarkelite.com/trademark/trademark-detail/88474539/DINO-HAZARD
Current status of trademark = "Dead"
The Dino Hazard game seems pretty dead too. He has a YouTube channel, but it's all about dinosaurs. Nothing about a dinosaur game: https://www.youtube.com/channel/UCjcEWCkuafL02yvkujCwL4w
The Steam page for the game is here: https://store.steampowered.com/app/1287540/DINO_HAZARD/
Would be a shame if it got review bombed!
You don't need to have a valid registered trademark. A registered mark only serves to increase your capacity to defend your trademark. A Common Law mark is sufficient within the US which specifies first to use and first to market. HOWEVER, that doesn't change the fact that we may be looking at trademarks within 2 different countries AND it still in now way changes the fact that the guy is attempting to claim copyright on YouTube videos for a Trademark dispute. Which is still illegal.
We believe that the developer of Dino Hazard who contacted us is Brazilian and wanted by the trademarks register organ used in Brazil. We made an search at the INPI and verified that there is a trademark registration with the name Dino Hazard in the name of the person who contacted us.
According to the registration of trademarks, similar or equal names and of the same specification - videogames - the registered name is entitled.
https://busca.inpi.gov.br/pePI/jsp/marcas/Pesquisa_classe_basica.jsp
1 - click "marca"
2 - search for "dinohazard" or "dino hazard" em "marca" and press enter.