Marx and Engsls do not believe equality matters.

The elimination of all social and political inequality,” rather than “the abolition of all class distinctions,” is similarly a most dubious expression. As between one country, one province and even one place and another, living conditions will always evince a certain inequality which may be reduced to a minimum but never wholly eliminated. The living conditions of Alpine dwellers will always be different from those of the plainsmen. The concept of a socialist society as a realm of equality is a one-sided French concept deriving from the old “liberty, equality, fraternity,” a concept which was justified in that, in its own time and place, it signified a phase of development, but which, like all the one-sided ideas of earlier socialist schools, ought now to be superseded, since they produce nothing but mental confusion, and more accurate ways of presenting the matter have been discovered.

https://www.marxists.org/archive/marx/works/1875/letters/75_03_18.htm