@KamranKhan1, correctly, the hardware requirements for Survivable Branch Servers are the same as the requirements for a Front End Server, the
link in your question.
Also, please note that
2.26 gigahertz (GHz) or higher is recommend.
Meanwhile, refer to below table to determine the best option when deploy branch-site resiliency:

More details, for your reference:
Branch-site resiliency solutions in Lync Server 2013.
Best Regards,
Allen Wang
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