Can I use method developed for one the drug in my first company to another company without telling the name of the drug. Can I use the data without telling the name of the product .
Simple really. No and No.
When employed, you probably were subjected to a non-disclosure or confidentiality clause in your employment contract. You must never divulge information learned at one employer to another without consent, and that restriction includes the protocols used for method development and validation, not just the data.
What you can do is take the published method development and validation guidelines from compendial sources, such as ICH and USP, and relate your experience to those guidelines using their general descriptions.
If, at the interview, your potential employer asks you to disclose any information that is not in the public domain, you don't want to work for them.
Good luck with your interview.
Bruce Hamilton