There's currently a check in `TransportService.HandshakeResponse.isIncompatibleBuild` to stop ES with the same Version but different build hashes from joining a cluster. This needs to be relaxed for cloud deployments where Version is not applicable
server/src/main/java/org/elasticsearch/transport/TransportService.java
tracer
        );
    }
    public TransportService(
        Settings settings,
        Transport transport,
        ThreadPool threadPool,
        TransportInterceptor transportInterceptor,
        Function<BoundTransportAddress, DiscoveryNode> localNodeFactory,
        @Nullable ClusterSettings clusterSettings,
        ConnectionManager connectionManager,
        TaskManager taskManger,
        Tracer tracer
    ) {
        this.transport = transport;
        transport.setSlowLogThreshold(TransportSettings.SLOW_OPERATION_THRESHOLD_SETTING.get(settings));
        this.threadPool = threadPool;
        this.localNodeFactory = localNodeFactory;
        this.connectionManager = connectionManager;
        this.tracer = tracer;
        this.clusterName = ClusterName.CLUSTER_NAME_SETTING.get(settings);
        setTracerLogInclude(TransportSettings.TRACE_LOG_INCLUDE_SETTING.get(settings));
        setTracerLogExclude(TransportSettings.TRACE_LOG_EXCLUDE_SETTING.get(settings));
        tracerLog = Loggers.getLogger(logger, ".tracer");
        this.taskManager = taskManger;
        this.interceptor = transportInterceptor;
        this.asyncSender = interceptor.interceptSender(this::sendRequestInternal);
        this.remoteClusterClient = DiscoveryNode.isRemoteClusterClient(settings);
        remoteClusterService = new RemoteClusterService(settings, this);
        responseHandlers = transport.getResponseHandlers();