Welcome to the forum Herbert.
If you look at
the project summary page, you'll notice that project 8014 has shorter deadlines than 8012/13, hence why it's worth less. All projects are benchmarked to earn the same Points Per Day, at least on the benchmark machine; hardware that differs from the benchmark machine may not scale evenly. But, in general (at least among projects that run on the same hardware), the longer the deadline, the more points it earns per WU.
The bonus point scheme was designed to encourage quick returns. As a result, many bonus-eligible projects have rather low base points, with the majority of your points coming from the bonus. With bonus, a TPF of 1:48 on an 8014 would come out to around 4500 PPD. That sounds roughly right for a quad-core AMD CPU, but I'm not very familiar with them. The breakdown would be 106.6 base points and 718.3 bonus, which is a good example of how much you earn from the bonus. If you don't have one yet, get a
passkey so you can start earning bonus points after turning in 10 bonus-eligible (SMP and many uniprocessor) WUs.