Mobile workstations w/Pascal Quadro

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I do 3D CAD work which occasionally includes rendering and simulation.  I am looking for a new mobile workstation and would like to scale down from a 17" HP Zbook to a 15" model.  While researching 15" models that have either a Nvidia Quatro P3000 or P4000 graphics card, it appears that the offerings from MSI, Boxx and Origin use the same chassis, with minor differences in specs, but wildly differ.  

 

MSI WS63 w/P3000 256 ssd/2tb hhd 16 gb ram i7-7700HQ $2399 https://us.msi.com/Workstation/WS63.html

MSI WS63 w/P3000 512 ssd/2tb hhd 32 gb ram i7-7700HQ $2599 https://us.msi.com/Workstation/WS63.html

MSI WS63 w/P4000 256 ssd/1tb hhd 32 gb ram i7-7700HQ $3099 https://us.msi.com/Workstation/WS63-Quadro-P4000.html

MSI WS63 w/P4000 512 ssd/2tb hhd 32 gb ram i7-7700HQ 4k screen $3399 https://us.msi.com/Workstation/WS63-Quadro-P4000.html

 

Origin NT-15 Quadro w/P3000 512 ssd/2tb hhd 32 gb ram i7-7700HQ $3073 https://www.originpc.com/workstation/laptops/nt-15-quadro/

Origin NT-15 Quadro w/P4000 512 ssd/2tb hhd 32 gb ram i7-7700HQ $3885 https://www.originpc.com/workstation/laptops/nt-15-quadro/

 

Box GoBoxx 15 SLM  w/P3000 512 ssd/2tb hhd 32 gb ram  i7-7920HQ $3433 http://www.boxx.com/products/mobile-workstations/goboxx-slm

Box GoBoxx 15 SLM  w/43000 512 ssd/2tb hhd 32 gb ram  i7-7920HQ $4455 http://www.boxx.com/products/mobile-workstations/goboxx-slm

 

The MSI WS63 w/P3000, Origin NT-15 Quadro w/P3000, and GoBoxx 15 SLM  w/P3000 all appear to be equivalent, with over an $800 difference in price.  While the MSI WS63 w/P4000, Origin NT-15 Quadro w/PP000, and GoBoxx 15 SLM  w/PP000 have over a $1000 difference in price. Granted the Boxx machines have a  i7-7920HQ vs i7-7700HQ in the others, this is only about a 10% faster processor.

 

Is it just that Boxx and Origin names come with a price adder, or do they really have anything over the MSI units?