Limpopo
Yes, that's true however its both important and difficult to compare like with like. The 92s have RIPS, aircon(?) and an APU whereas the 225 do not.
However the 92 needs RIPS whereas the 225 does not in practice need the EC equivalent in the N Sea, the 92 has an APU as standard and you can't start the engines without one, whereas the 225 only needs APU to keep the cabin cool before start in VIP machines. And aircon is a nice-to-have on those 3 days a year when its hot on the ground, but no use once you are airborne.
So if you wanted to be nasty to Sky you could say that yes the 225 has 1000lbs more payload. If you wanted to be nasty to EC you could say that a 225 of the same spec as a 92 only has about 200lbs more payload.
Or you could be simplistic and say that both aircraft do pretty much the same job and the 225 has an extra 1000lbs which means its ability to carry 19 is never an issue, which is not the case for the 92. This is my preferred answer
HC