Can we connect Secondaries of two step down transformers parallell to a common load without a coupler breaker?

The primaries of the transformers are connected to a common HV feeder.|||You cannot. To connect two transformer secondaries in parallel, the transformers must have the same voltage rating in primary and secondary.They should have the same turns ratio and internal resistance amd inductance. Also, the transformers should have the same kVa rating. If not, they transformer will be burnt.