Biblical vs systematic theology

[Yeshua1]

I say no. It would not be Paul's view of justification. It would be Paul's theology which happens to include justification among other things. Picking a topic is a systematic way to approach an author. Biblical theology would see the author's thoughts and theology develop and explain that. It would see how his theology and thinking are interlinked in the development, such as Paul's monotheism, election, and eschatology.

Would there be some overlapping between say John and paul, but also some distinct differences in some areas of theology ?