I think it could go either way. Could be they have an advantage in terms of gears that are better for climbing. Could be they are just in better shape, or better suited physically for climbing and generally riding fast. Could be their bikes are just lighter and made to go faster.
Best way to tell -- borrow one of their bikes, or test ride a new one at an LBS, and see how it goes.
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles