i don't think they are the same , payeer is more mature in term of date , but they may have some partnership .
i see webmoney/advcash/perfect money from the same perspective .... never moved money via payeer but i think they fit into this category with okpay,but okaypay is the worst -- close accounts automatically. i can't say that i can trust my real id on either platforms .
advcash is exception they don't monitor accounts under no conditions.