Some of the recipes I see call for 350L chocolate malt, some call for 420L. Is there a secret to getting one over the other? Do different maltsters roast their chocolate to different levels? I've got a handle on the pale 200L chocolate, but the 350/420 thing is still over my head.
And while I'm on the subject, what do you do if you need one and can only find the other? I imagine I could darken up a recipe with a bit of carafa, or I could just use more 350.

