To me it's quite simple and I think my opinion is well known: both generation Scudo/Jumpy/Expert and both generation Eurovans are French origin, and all generations Ducato and its twins are Italian origin. I haven't a precise idea about the earlier 242/C35, and we're discussing here about the Minicargo.
First generation Ducato was styled at Fiat's styling center by Paolo Boano. Its development started mid-70s, even before Sevel was created (1978), and initially it appeared it would have been a scaled-down Daily, then they changed to the design we know. The second generation was designed at Italdesign, whereas the third was styled by Mike Robinson, at the time head of the Fiat styling center.
I also think we should add chassis codes:
[280] for 1a serie
[230] for 1994-2001 2a serie
[244] for 2002-2006 facelifted 2a serie
[250] for 2006-2014 3a serie
[290] for 2015-current facelifted 3a serie
Sevelnord vans instead were enginereed by PSA, and their styling (at least for LCVs and [U60]) and mechanics reflect this.

The green van could be the rejected proposal by the Fiat styling center, but it appears to be smaller, some did even speculate that it was based on Panda [169]'s platform