Hey Suraj,
yes, it could be a difference with the broker’s data. That is why there is the option in EA Studio to import your own data because the brokers offer a way to different quotes, which results in different Historical data.
I would suggest you generate EAs with your own data, instead of optimizing the EAs.
Also, you can use the Historical data from the Free App which we have on the website, and there is a video in there where I explain how to fit that data for your broker.
Cheers,