@Anil Kumar Reddy N Thanks for reaching out. Here is the detailed blog post that contains the announcement for the newer exams: New beta exams AZ-303 and AZ-304 for Azure Solutions Architects
Quoting what you're looking for:
If you already passed either AZ-300 or AZ-301, you could take the new version of the complementary exam. The following exam combinations are valid for earning Azure Solutions Architect Expert certification: AZ-300 and AZ-301; AZ-300 and AZ-304; AZ-301 and AZ-303; or AZ-303 and AZ-304. (To see which exams you passed, check your transcript.)
Regardless of which of these exam combinations you take, when you pass, you’ll have earned your Azure Solutions Architect Expert certification and it will be valid for two years.
Also, please note that Microsoft Certification related questions are currently not supported on the Microsoft Q&A platform. You can get help through the moderated certification support forums.