But why would you want two different products? It sounds like you like the "girl" lego much better than the "boy" version. Why not make it accessible to all kids?
Outside of the box packaging, lego's are gender neutral in terms of red/blue/black/white snap together boxes. My daughters built play houses and towers until they were 12. We (society) have missed the point if all we do is encourage building what the 'set' advertises ... In my generation it was Tinkertoys and I built lots of interesting creations using my imagination instead of using directions.