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Yeah they combined SIDs and departure procedures into DPs.
The only difference i can come up with between the two is that in the past departure procedures where used for obsticle clearence and SIDs are used to simplify clearence delevery and traffic. I also recall that DPs are not always assigned in a clearence, and it is the pilots responsibility to comply with it. Whereas SIDs are included in your clearence.
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I knew of the existance of the two and their differences, but wasn't aware that they'd been combined.
Learn something new every day!