Identify the job apple butter is doing in your recipe (sweetness, fruit flavor, moisture, or filling).
Start with the closest match ratio from the list (use 1:1 when you need similar fruit moisture; use ¾:1 when the substitute is sweeter).
If your substitute is thinner than apple butter, strain or reduce it for 2–5 minutes in a small pot to thicken before mixing.
If your substitute is sweeter (jam/purée), reduce added sugar by 1–2 tablespoons per ½ cup substitute.
Bake as directed, then check doneness 3–5 minutes earlier if you thinned a jam-based substitute or expect faster browning.