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Short answer: Yes, this works.
Longer: If Site B can communicate with Site A; and site A can communicate with the AWS VPC; then generally Site B will be able to communicate with the VPC.
This does depend on whether Site A (the routers/switches/firewalls) allow communication from Site B to AWS so that would be the thing to check. If possible, avoid overlapping IP addresses; and ensure that firewalls allow two-way communications.
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Thanks Brettski, yeah I thought so that Site B can communicate with AWS via Site A provided all components like routers, switches etc are aligned. However, taking a step back, my first question is even more basic - how do I mount the existing on-prem NFS shares to the EC2 instance (site A or site B). Can I do that? I am not using EFS. Thanks again
NFS is network agnostic. If the endpoints can communicate with each other (IP/TCP/UDP and appropriate ports) then NFS works. There's no difference (except in performance) mounting a NFS share that is on the machine next to you as compared to one across the world.