No you do not, or at least that is not how I understood it, it says 'choose two Race options', they can come from either race. So just like LU, except that it is more flexible (because there are no two categories where you have to pick one from each race)Heritages in LU consist of heritage traits and a heritage gift. To make a PC with a mixed heritage, you choose the traits from one heritage and the gift from another. In the playtest, you pick all the mechanical expressions from one species, and just roleplay whatever you want. Does that seem like the same thing to you?
So yes, the end result feels like it is very much the same, 6 in one, half a dozen in the other.