A: Sometimes. Often they are "fan dubs" (recorded by fans in a basement) or audio ripped from TV broadcasts. The official studio dubs are always superior.
Today, every major South Indian film releases a theatrical Hindi version simultaneously. The delay that caused piracy in 2018 no longer exists.
We strongly advise against using Okhatrimaza or any torrent site. Not only is it illegal, but it also steals revenue from the carpenters, VFX artists, stunt doubles, and musicians who built the 2018 films you love. If you want to explore the "2018 work," visit a legal streaming service. The picture is cleaner, the sound is clearer, and your computer stays safe.