Talking of the song,the words "Dil and "khamosh" are both used in Hindi and Urdu. The other words 'baat' 'na' and 'kar' are of Sanskrit origin. Kar is derived from the root word 'karma' (pretty famous word) ,'na' from 'na' (meaning 'no/don't') and 'baat' from the word 'वार्ता ' i.e varta. Let me explain you in detail. वार्ता -------.> बात (Even they look almost similar and they mean 'talk') Kar------.> Karma (meaning to do,actions ) na--------.> na (meaning no) Now coming to the other words ,
"Khamoshiyan" and "dil" are not Hindi or Urdu words. They are actually Persian words. To understand it, you shall understand the origin of both languages . Urdu originated in in 13-14 cent. The persian rulers who invaded India had brought 'Persian' with them.The original language of India was Sanskrit ,Tamil and a number of south Indian languages. Sanskrit is probably one of the oldest language ever(Tamil might be older) .Sanskrit happened to be the first language with formal grammar.A majority of languages have been influenced by Sanskrit ,even Japanese. (unconfirmed claim). Sanskrit although had issues for it was pretty difficult.Therefore, it's dialects were adopted.Those two being 'Pali' and 'Prakrit'.Then there happened to be many more dialects.These being awadhi,braj ,bhojpuri etc.
This where "Urdu" originated . The Persian language got mixed with these dialects and Urdu was born. So to sum up, Persian(dominant) + Sanskrit dialects = Urdu Sanskrit dialects(dominant) + Persian = Hindi Hindi is more inclined towards Sanskrit than Persian than urdu is and vice versa. Urdu infact is influenced by Indian dialects. A braj phrase:- "Yasodha Hari palne jhulawe" "Malhave,dulrave ,mere laal ko ao nidya "kahein nahi tu aave?"
That's awadhi of 14th century.People can understand it enough and so can I.India has more regional languages than "one prominent" one.
Again,you say that Hindi and Urdu have different vocabulary lmao. That's probably the stupidest thing I ever heard.Yes,there are some differences in Urdu and Hindi.Yet, Hindi and Urdu are considered to be "mutually intelligble" languages. The finest proof of the statement :- Do ya even think Cartoon Network even dubbed Naruto,Dragon Ball,Beyblade,One piece ,Pokemon in Urdu lol ? No All these shows were dubbed in Hindi.Cartoon network didnt dub any of these shows in Urdu.Even Doraemon and Shin Chan are dubbed in Hindi and not in Urdu.These Hindi dubs are the one which are aired in all the neighbouring countries of India, be it Pakistan or Bangladesh.Yes,CN targeted Indian Hindi speaking audiences and not Pakistani audiences.
The proof is that all the voice actors were Indians.These Hindi dubs are the ones which you grew up watching,"not the Urdu dub".Urdu dubs till 2010 didnt exist ,at least for Naruto,Dragon Ball,Beyblade,One piece ,Pokemon.
After this it stopped airing in India and therefore in Pakistan.
All the major channels only dub in Hindi and this is what Pakistan watches.
Also ,yeah it's a fact that Urdu developed ~100 years earlier than Hindi did.One of the probable reason was that the Invaders wanted to rule India and needed a better way to communicate.
Coming to the next point,THE SONG IS AN Hindi SONG. HariHaran (Sanskrit name,meaning Vishnu) is an Indian artist.
This is the song.be sure to check it out .Now ,if you dont know Naruto is heavily influenced by Hindu mythology . More or less everything is influenced by Hinduism in Naruto. Even the word 'chakra' is Sanskrit lollllll. Indra and asura ,the Indian Gods. Infinite sukiyomi. Pain's ideology. 8 gates. Third eye. Indra's arrow. Almost everything.