if it would be that to follow Buddha means to reduce harming, develop compassion and help others and out of that your own mind gets calmer and your life is filled with loving kindness and joy, would it be different to someone who practice 100% in following Jesus?
I would think so, Hanzze, yes.
(However, my question was not about that issue).
Than I would say, a real practicing Christian is not different to a real practicing Buddhist. There might be some other rituals or prayers. If you know the different in Christian you also know the different in Buddhism and also the wide spectrum of different kinds in different tradition.
If you search differences, I can not see that much but as well as in Christian there is also a big desire to find differences by many "practicing" Buddhists. So maybe I am really off topic.
Practising moral virtue and being a 'good' person is not what defines a Buddhist - it is Refuge in the 3 Jewels.
Buddhists, Moslems, Jews, Christians, Hindus, Jains - all may practice moral discipline, but for quite different reasons.
As a Buddhist, I believe that all, however, share in the benefit derived from positive karma.
The motivation for a Buddhist is derived from Buddha's teachings and framed within Refuge.