Dear Marcin, this is a risky procedure and I do not recommend it, at least not in a general sense. It might work with sumatranus, since we have this peculiar feature that these fish look similar to the bintan-group, but display head-up! In both sexes! Therefore I assume that the male will not take other females and the femals no other males than sumatranus. But in nearly all other cases (species/variants/forms) the mode of displaying is head down and we can be not sure at all whether the males of A will definitely choose females of A only, and vice versa. Therefore we try to avoid such a situation by strongly advising all friends not to take the risk of a soecies-mix. Maybe, the males/females themselves are more clever than we are and recognize the right partners even when we are unable to do so. But who knows?
Therefore, I should recommend to give it a well-controlled and -documented try with sumatranus, but – please! – not with other Paro-species!