The "Points" system is well non-uniform there is a post somewhere else on this forum about them cutting the credits per WU in Half to match "SETI" I think it's in MilkyWay @Home.
It's entirely up to the project Admin how many points they attached the WU's they might adjust them by the size of them compared to an average one or how long you took to complete compared to some "test" machine - like the Old Seti@Home used to base itself on a P150 I think..