In over 25 years as a kitchen fitter I have never heard of a builder fitting the granite themselves. It is a specialised job that requires accurate templating. The join in the centre of the hob is dire. and the other join isn’t much better its wider at the back than at the front. There is no way I would accept the two different profiles.
Granite work tops are expensive and supposed to be a thing of beauty.
If you accept that it will annoy you forever.
This is very true.
The tops wont be flush where they join because; a) the units are not level. b) there is a difference in the thickness of the stone which suggests the pieces came from two different batches( not good practice). Even so good fitters would have used shims and packers to make them flush before jointing.