You are right actually...
ShivIka story is a lot similar like ArShi...
The hero being a angry business tycoon & the heroine being bubbly, chirpy, quirky & happy types...this is a ditto copy...
Though Anika has some past to be revealed related to her family, but otherwise she is shown as an orphan, so was Khushi...
Arnav used to love his sister Anjali & in IB irs about brother's love...
And there are many more...So basically, only if we consider ShivIka story then there are many similarities between IPKKND & IB...
But, then again, we are having a big difference...which is supposed to change the setreotype thought process of society...Anika not having a surname & working with full dedication to earn respect & acknowledgement...that's something huge & awesome...& Shivaay is a God-believer unlike Arnav who used to avoid temples & Gods...
Hence, we can say that with some similar colours from IPKKND along with some classic additional touches, IB is a great show afterall...just lije IPKKND used to be...
I just wish that IB doesn't end within 2 years like IPKKND...