Erythrina sykesii Barneby & Krukoff, Lloydia 37: 447 (1974);
Australia; New Zealand(North) as per CoL:
Flowers fairly similar to Indian Erythrinas…
Yes they are, but leaves differ in shape.
Looks different from images of Erythrina vespertilio at Wikipedia Factsheet Useful Tropical Plants Australian Native Plants Society
Erythrina x sykesii ??
Difficult to say with the posted images.
Erythrina ×sykesii Barneby & Krukoff
Yes, some possibility as per Lucid Central. Not sure.
References: POWO Catalogue of Life The Plant List Ver.1.1 ILDIS Lucid Central