  As it was recently shown, the colour singlet BFKL kernel, taken in Moebius
representation in the space of impact parameters, can be written in
quasi-conformal shape, which is unbelievably simple compared with the
conventional form of the BFKL kernel in momentum space. It was also proved that
the total kernel is completely defined by its Moebius representation. In this
paper we calculated the difference between standard and quasi-conformal BFKL
kernels in momentum space and discovered that it is rather simple. Therefore we
come to the conclusion that the simplicity of the quasi-conformal kernel is
caused mainly by using the impact parameter space.
