Decide your texture target: keep a tender-crisp bite (sauté/roast) or go softer (steam).
Choose the closest match from the table: broccoli rabe for leafy snap, broccoli florets for the most direct flavor/shape.
Use the listed ratio (1:1) and cut stems/spears to similar thickness so they finish together.
Adjust cook time by 1–3 minutes: thicker stems need longer; leafy greens like rapini may need a quick blanch.
Finish with the same flavor style (garlic/lemon/chili flakes or sesame/soy) to mask small differences in natural bitterness.