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That is correct PrivateLink supports TCP protocol only (as of today), there is also VPC Lattice which allows connectivity between VPCs using overlapping CIDR but it supports HTTP/HTTPS and gRPC protocols only (as of today)
Take a look at solution described in this Whitepaper which explains use of Private NAT gateway for connectivity between 2 VPCs using overlapping IP CIDRs or for connectivity towards on-premises network.
Note that the AWS NAT gateway supports SNAT (Source NAT) only, for more advanced NATing scenarios (DNAT etc) you can look at 3rd party firewall virtual appliances or NAT instances.
In general it is best to just avoid using overlapping IP space.
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Thanks a lot. Does AWS has any reference or whitepaper on using IPv6 in overlapping scenario ?
Not specifically for IP overlapping scenario but take a look at the IPv6 on AWS whitepaper: https://docs.aws.amazon.com/whitepapers/latest/ipv6-on-aws/IPv6-on-AWS.html