I underpriced myself……..,.

I got a job offer in a leading tech company in Colombo. In the last interview they asked me what my expectation is and I gave them a number. So that’s what I got upon the offer.

Someone I know from my MSc studies, also applied, and got the offer with a slightly different title, and a better salary. She had said that exact salary on the interview. She and I have the exact same qualifications, and I have slightly better experience that aligns with this role. It’s a 40k difference.

Should I try to negotiate with HR or just accept the offer as it is?