I dont think the sniper could win that battle but it might be a little closer than some might think if it was fully modded with an UMA 65mm and super pro head. It's just a guess based on the #'s you listed and if i remember right the 65mm with super pro is supposed to produce 31 hp, so it's not so far off but a lot of variables. Put a crappy rider on the R25 and a small rider with really good skills it might be a close one. But then again i love the sniper and UMA and i always go for the underdog !!!
It wouldnt be a blow out but i think that the R25 would prevail.