Do the MacBook Pro (15-inch, 2018) have different cooling systems depending on the GPU I read here that the thermal throttling of the i7 and i9 on the latest MBP (2018, 15-inch) can be significant.

I also got information that the cooling system is different when the MBP is upgraded with the VEGA GPU: is this correct?

This would mean that paying the extra for the VEGA GPU could also have a positive impact on the CPU performance, and thus big a global gain.
I hope this picture answers your question, my previous post was absolutely wrong, that's why i deleted it.