Of course they're the same SKU... they are both 6/12 both 65w TDP and both have the same cooler but because AMD put an X on the end it must be the replacement for the 3600X which is a 95w part. Please don't fall for the marketing as I'm sure you certainly wouldn't if Intel pulled that trick.
Yep. The Ryzen 5 5600X has the same 65W TDP and even the same Wraith Stealth cooler as the Ryzen 5 3600. So realistically it was the Ryzen 5 3600 replacement,but AMD knew they were onto a winner. I knew this day was coming,as I remember the Athlon 64 days,when AMD was on a winner and priced it as high as they could. At that point I just held onto my Athlon XP for a bit longer until mainstream dual cores appeared.
What I blame is all the people who bought the Core i5 K series at £250~£300(which created the overpriced 6 core CPU segment),who then bought the Ryzen 5 5600X at that price too. I OTH refused to do,so managed to get hold of a Ryzen 7 3700X for just over £200(when the Ryzen 5 5600X was £280~£300 at retailers),and a Core i5 10400(the one with an IGP) for just over £100.
At this point if Intel,AMD,etc want to overprice their new CPUs,then I will just wait for a few years. I survived on socket 1155 for nearly 7 years,so I can wait a few years on what I have now.