I noticed that some wineries from Bordeaux, I noticed that they have a Bordeaux wine that has a Bordeaux blend. With the exact same name (only difference is Rouge vs Blanc)

However, 1 is red and the other is white. from the same Bordeaux Blend. How do they do that? for example,these 2 wines

https://www.totalwine.com/wine/red-wine/bordeaux-blend/chateau-la-rose-de-vitrac-rouge/p/152313750

https://www.totalwine.com/wine/white-wine/bordeaux-blend/chateau-la-rose-de-vitrac-blanc/p/152315750?s=1405&igrules=true

Dining and Cooking