[arr] Big confusion: Saiyyan song from Nayak

[Jahanzeb Farooq]

I am really confused. Is the Saiyyan song sung by Rithisha Padmanabh 
in last VOI episode same as Saiyyan from film Nayak? The two songs 
sound same but the lyrics are very different. If the original song is 
from Nayak then did someone reused it with different lyrics? or it is 
some common tune which ARR reused? Could someone plz shed some light 
on it?? Thanks.
Here is the link to Rithisha Padmanabh's Saiyyan in VOI. 
http://www.youtube.com/watch?v=NvhXLVpKOnI