They are not 65cm at all! I haven't even paid attention to that - probably because I didn't need them that long. Mine are 47cm from end to end plug - all of them.
But please note: The cables are (incomprehensibly to me) packed/shipped folded twice (kinked) !!! If you want them nice and straight, you'll have to buy a more expensive set and hope that they're smarter about it. Or stretch the cables and straighten them again - which can take time (especially in winter). Hope this is of some use to you.
I want to assemble a PC on a movable shelf under the height-adjustable desk, and I would like to distribute the weight by moving the power supply away from it. For this reason I am looking for longer cables. I think I've found them but they cost a bit.