Why Bathurst corvettes were not merely enlarged Flowers

Why did Australia build Bathurst corvettes rather than Flower-class corvettes?

Bathursts better suited Australian and Far Eastern conditions, combining anti-submarine duties with more surface-threat capability.

The Flower class was designed around anti-submarine work, especially in the North Atlantic and alongside the Royal Navy. The larger Bathursts had to expect surface threats and less destroyer support in Indonesian and Far Eastern waters. Their more capable gun fit answered that broader local requirement, although it came at the cost of slower construction. Their hull form was also better adjusted to Indian Ocean and Pacific conditions, while the Flower's form answered North Atlantic needs.