Microsoft System Design Interviews

Have onsite interviews coming up with microsoft and facebook in a few weeks from now. How different are sys design interviews for Sr. Engineer at Microsoft as compared to the interviews at Facebook? Been prepping using the sys-design-primer/system-interview/Grokking/designing-data-intensive-applications-book and done a few mock interviews for my Facebook onsite prep. Learnt from a couple folks who interviewed for senior engineer positions at MS recently and were asked low level system design questions and with focus on concurrency which is something I don't feel comfortable with right now. Any help is appreciated. 🙏 TC 310K