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You can associate the private hosted zone to VPCs in other accounts with CLI. By association, mutual name resolution is possible.
https://docs.aws.amazon.com/cli/latest/reference/route53/create-vpc-association-authorization.html
answered 3 years ago

Note that the DNS resolution will NOT traverse the TG, it uses Route53 backend resolver to resolve domain names between Accounts. This is carried out under the covers.