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This is a very good question. I will reassure you that you can install a pull out drawer 100 cm https://www.ikea.com/ca/en/p/komplement-pull-out-tray-beige-40509096/#content in your Pax Wardrobe frame 100 cm: https://www.ikea.com/ca/en/p/pax-wardrobe-frame-beige-60509024/#content.
If you look at both links you will see that the interior measurements are 96.2 cm for the pull out drawer and the Pax wardrobe frame, there is no problem to install the pull out drawer inside the frame.
I understand your confusion because for example the pull out drawer in white & even in dark gray show 100 cm as the total exterior measurement: https://www.ikea.com/ca/en/p/komplement-pull-out-tray-white-70246386/.
There's a mistake in the drawing measurement, thank you for noticing it, we will have it corrected.
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