Give your advice. How long to wait before telling her fully about who I exactly am and the Khushi detail?

So as you all know in my previous post I mentioned about this girl Khushbu from my MBA campus who is my junior and looks very similar to this another girl Khushi who was my classmate in 1st year of MBA in 2023 to early 2024. We only met once 2 months ago when I visited campus for finishing formalities. I did say her she looks like Khushi and she smiled and laughed off saying "Ohh really?" So we finally connected on Instagram 2 days ago and she replied to my dm today. We are chatting but she mostly doesn't remember me now as we only met once in person 2 months ago so our chats have been just normal about MBA and stuffs. She is 21 or 22 now and I am 24. My MBA is freshly done and next month is my official graduation so yeah I don't get to meet her as campus life is pretty much done for me. I want to tell her that I am the guy who visited campus 2 months ago and said she looked like Khushi but as we just started chatting, I don't wanna make the chat feel awkward or overwhelm her. How long should I wait before telling it to her?