no you would be paying for the HKS combination
what ever spec, wheels, housing options etc are on the 3037s Pro there cannot be an equiv garrett unit
ie: you cant order a Garrett 3037s Pro as its a HKS locked item, and HKS have exclsuive rights to that combo
Garrett do many OEM style turbochargers but they also make turbochargers for HKS
any HKS combination that HKS come up with is made by Garrett but you can't buy it from Garrett, it must be from HKS
so its likely the 3037s is a well setup turbo for some specific engines, as HKS do the R&D and testing etc and say
we believe the combo is spot on for x.x litre engines and XYZ displacement or exhaust setup
so we've spent 10,000 hours and spent all the money testing out the combo, so you can have it with the HKS branding