Caster sugar

Use the same weight. It is slightly coarser, so stir a little longer to dissolve; in baking, grind briefly if a fine texture matters.

Use the same weight, but dissolve it earlier as it is coarser. It adds a light caramel note and a little colour.

Use the same weight; crush or grate jaggery first. It darkens the dish and adds molasses flavour, so reduce other liquid slightly.