I don't have a huge problem with matchy twin sets but it's not something I'd do personally.
The closest I would come to being matchy is having the same first initial and even then it would be unintentional.
Honestly I'm thinking of my boys' names when I say that. My top three faves all start with R, so it would be unintentional but still possibly perceived as matchy.
Naming twins
Faith and
Hope or
Lily and
Rose, for example, would be too matchy for my tastes.