Salesforce onsite Data Concepts system design vs architect system design

I have a salesforce onsite and recruiter mentioned that there are two system design rounds 1. Data Concepts system design 2. Architect system design 1,what is the major difference between them? Does Data Concepts system design focuses on API and databases ? Is https://www.educative.io/courses/grokking-the-api-design-interview is good learning reference or any references for Data centric system design 2.I believe Architect system design focuses on building apps like WhatsApp , Facebook feed ? Tc 250k #salesforce #servicenow #microsoft #meta #facebook #google #amazon #oracle