Yes to both questions.
Per Jamil in his article on Roggenbier...
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Quote:
Jamil in Oct BYO
To develop color without adding roasty flavors, a little debittered black malt does the trick. My preference is for Weyermann Carafa Special, a huskless roasted malt. The lack of a husk means far less bitter roasted flavors."
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He says that the regular Carafa has "a lot more roasted character"
The crystal malt may be a bit more caramel-ly, but will be a good sub.
Cheers.