There's two options when it comes to sharing resources that live in either different VPCs and/or different Projects in GCP
For Different Projects - Use a Shared VPC
A shared VPC is a single VPC that can host resources belonging to projectA, project b etc. Project A is designated a HOST Project (And is associated with all billing for resources in the Shared VPC)
For Different VPCs - Use VPC Peering
Peering works just like it does on AWS or Azure. It is way to provide an encrypted connection between two VPCs. It differs from a VPN in that the encryption is at the network layer.
Also read - Sharing Resources across GCP Projects and VPCs
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