Pirc and KID are actually very different despite both being king's fianketo defenses with very similar pawn formations for black.The presence of the pawn on c4 in KID creates a lot of very important differences.
Your Pirc knowledge is totally irrelevant for KID.Don't expect to be easier for you to learn KID.In fact be prepared for a totally different opening.
You can't know if KID is good to you until you try it.
Thanks for your help, Olympian256. I really appreciate it. 
Could you elaborate on the "very important differences", please?
On that last point, I am hoping to try it soon. I can tell already from looking at some of the positions I rather like them. To me, the KID seems to yield closed positions while being a bit more sound than the Czech Benoni, an opening I tried in some unrated OTB games with surprisingly strong results against superior opposition, but am still a bit nervous about using.
In the Pirc, a common plan of White's is Be3, Qd2, and Bh6, destroying Black's fianchetto. I've been doing a lot of digging in the Game Explorer, but I don't seem to find this plan occurring very often in the KID. Why?
Hello all,
I currently play the Pirc as Black against 1. e4 and have been told that as a result, I should look at the King's Indian Defense as a potential response to 1. d4. I don't know very much about the KID, other than the fact that it looks very similar to the Pirc, but I have heard a lot of people say that these openings are quite different despite the similarities in Black's structure. (One point of emphasis I have heard is that in the Pirc White plays Nc3 early, with his c-pawn stuck behind it. In the KID, White's pawn comes to c4 early. I assume this means White will look for more queenside play, though I could be wrong.)
My questions are:
I know this is a lot to ask, so I would like to thank everyone who responds in advance for the help. Thank you!