The only real difference is men’s lib burdens themselves with a feminist perspective, which does not help, and as this post shows, hurts.
At risk of getting out of context, I (cis male) did not become aware of the systems that were damaging me until I started studying feminism. Whatever a “men’s liberation movement” looks like, it is so young and inexperienced that it would be well served to examine and learn from feminist ideologies and perspectives.
Many of the power structures that feminists have identified as being damaging to women in general are also damaging to men in general.
Many of the power structures that favour men in general are damaging to women in general. As we grow and develop, we should be striving to tear down those structures that are harmful to others, rather than further entrench them as if in battle or in a zero sum game.
I’m not aware of any modern feminist ideologies or initiatives that present a danger to men, but if there are any, they should be called out by both feminists and “masculinists” in the same way that both feminists and masculinists should be calling out any masculinist ideologies and initiatives that present a danger to women.
Modern intersectional feminism has grappled with the inclusion of women who have been “othered”. We should be trying to learn from that and avoid making the same mistakes.
In the end, we all have to figure out our place in the world, and that cannot be done without considering our relationships to the power structures and each other. At present, that looks like it’s necessary to have feminism and masculinism as separate movements, not as enemies, but as collaborators and intersectional movements. Biology, including the fact that sex and gender are spectra with bimodal distributions, may always mean that they remain at least somewhat separate even as shared goals are achieved.