How about the speaker comparison for Dyanudio Contour 1.3SE and Contour 1.8 MK II

I have own one Contour 1.3SE piano finish, since i have change the pre amp from tube to SS. The thickness has become lean some what. Is it a good idea to replace my 1.3SE to 1.8MK II with better bass response which might be able to link with more thickness as possible to compensate the lean forward sound of SS pre amp.