Product dimensions DIY vs regular 12th gen

Hi, I’m maybe buying a DIY 12th gen soon. I had a question on the product pages. The listed dimensions of the DIY edition are 14.00" x 9.80" x 0.74" and 4.4 lbs, which is pretty chunky and not all that appealing as a thin & light upgrade to my already-dying 2019 xps 15. However the dimensions of the prebuilt version are listed at 296 x 229 x 15.85 mm and 1.3 kg, which works out to ~ 11.7"x9.0"x0.6" and 2.9 lbs which is very appealing.

My assumption reading all of the marketing literature is that the two versions are exactly the same laptop, right? Are the DIY specs wrong? Outdated? The dimensions of the box all the parts come in?

Thanks in advance for clarifying this topic.