Borate glasses are archetypal amorphous oxide characterized by important medium range organisation. These glasses exhibit pressure-induced boron coordination change. The conversion three-fold coordinated boron to four-fold coordinated boron upon pressure has been clearly pointed out for pure borate glasses and exhibits a non-linear behavior. The add of some alkali can transform the non-linear behavior into a linear one (Li). We propose to perform in situ high pressure neutron diffraction on an alkali diborate glass (Li2O-2B2O3), that we already characterized by inelastic X-ray scattering (IXS) at the B K-edge. The complementarity of IXS (local boron changes) with neutron diffraction (medium range changes) will give us a complete overview of the amorphous-amorphous transformation with pressure and a better understanding of the composition effect on densification processes.