Need some sizing help on these

I am normally a US 10 in sneakers but I’m not sure what size I’d be in Balenciaga bc I’ve never bought their shoes. Also, is it ok to buy shoes from CETTIRE, I have bought other things from them but not shoes. Thanks.

I am normally a US 10 in sneakers but I’m not sure what size I’d be in Balenciaga bc I’ve never bought their shoes. Also, is it ok to buy shoes from CETTIRE, I have bought other things from them but not shoes. Thanks.