Gateron Reds are clones of Cherry MX Reds and not
significantly lighter than Cherry MX Reds.
The "MX-Board 6.0" has the same Cherry MX switches as other keyboards have - there is no difference whatsoever. The supposed faster response time is not in the switches but in the electronics that is used to read them.
Gateron does have a 35g linear variant of its KS-3 series
, but it has a translucent white slider (which looks like Cherry MX Clear).
Because Gateron KS-3 switches are clones of Cherry MX, you could put those springs in Cherry MX if you'd want, to but Gateron's switches are somewhat smoother than brand new Cherry MX switches so you might want to swap the entire switches anyway.
There may also be light third-party springs out there that you could put into Cherry MX switches to achieve the same effect.
The very lightest switches I have tested are Cherry MY that have been modified: the main spring has been removed, leaving only a light leaf spring. Those have less than 10g actuation force.
Cherry MY are only available on keyboards from Cherry itself, in their G81 series and they are not Cherry MX-compatible. The unmodified Cherry MY switches are not very well liked: they are linear, but the force/travel curve is very sharp, which gives a mushy feeling.
The biggest reason for buying a Cherry G81-series keyboard is otherwise to harvest keycaps from them: most
keycaps are Cherry MX-compatible but the stabilised keys on some of these keyboards are not.Edited by Findecanor - 10/1/15 at 12:19pm