No, i mean dry heat is very dangerous for dehydration. Extremely dangerous even. However, if you take in enough salty solutions, and drink 2 liters+ of water during the game, you'll be totally fine.
I'd still recommand to put the entire team on a Na+/K+ baxter afterwards, just to make sure. And 30 min breaks to make sure they'll take in enough water.
Now, wet heat, thats a pain. You will feel deadtired, and its extremely hard on the heart and body. Marchisio and Verratti talking about hallucinating, is not uncommen in such circumstances. Fifa should have fucking allowed waterbreaks, and players to cool themselves down with coldbags during that break. Its about the only thing you can do, because they body is doing tremendous work to sweat