Probably more. This isn't a "new guy" "old guy" take, "back in my day" nonsense, I think there's merit in looking at the individual loads from WWII to 2013 GWOT.
I'd bet if the individual soldier's load decreased from the 1940's to the 70's, it is because today relies more on tech and the vehicle/ gun truck carrying water, food, and ammo resupply. That in turn allows for an increase in other stuff. In other words, I doubt today's 11Bs carry less than a 1945 11B. If anything, today's 11B carries more. Look at the M-16, M-16A2, and M-4 with attachments. Take a pound or or 3 of the rifle, but add 2-4 pounds of gadgets. Lethality increased, but your spine and knees do not care. 1945 didn't have batteries. A C ration is roughly half the weight of an MRE, but add platoon gear like ammo and med supplies.
I'm not shitting on my grandfathers or Gunz, I think the game changed because of technology. At the end of the day, even my fobbit ass recognizes being Infantry is an extremely shitty, but strategic-level necessity. A lighter rifle or whatever means you can now carry an extra 5 pounds of ammo, 3 pounds of batteries, etc.
Your knees and back do not care.
1945 and 2012 are now terrain and weather arguments. At least to this Bagram To Go tray outsider.