Hackers Help: IKEA Kivik – are the depths of the various parts really different?

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I am trying to build a Kivik combination (leather) that is not really supported by Ikea:

starting from the left:

– chaise

– corner unit (includes loveseat + corner)

– one seat section

It all seems possible except joining the one seat to the corner. The store sales person told me that the “one seat section” has a different with than the corner.

Looking at Ikea’s website things get even more confusing:

– leather “one seat” shwos a depth of 37  5/8″

– fabric “one seat” shows a depth of 38 5/8″

-> why would the leather and fabric not have the same dimensions?

In any case the leather corner section shows a depth of 36 1/4″ (in leather). The Fabric is again a bit wider.

Does anyone have more insight into this? Can I join a one seater to the corner?

Image credit: IKEA.com