Choose based on the dish: soups need similar bite and boil time, while baked dishes need similar ability to hold sauce without turning mushy.
Use the listed ratio to start (for emergency swaps, measure carefully because texture differs).
Cook the substitute slightly less than you expect (about 1 minute under) and finish in the sauce or broth to match ditalini’s final texture.
If your dish is very saucy or watery, reduce final liquid or add a spoon of starch (like pasta water) after simmering for 1–2 minutes.
Taste and adjust: add a pinch of salt to the cooking liquid for soups, or increase sauce seasoning for baked pasta so the smaller shapes don’t taste flat.