Bloch Synchrony Canvas Ballet Shoes - All Questions

It is the first time I buy ballet shoes in Europe (originally from Brazil). For sneakers, my EU size is 38, but for other shoes like flats/ballerinas it is EU 37. Considering that, what would be the appropriated size to order the Block synchrony canvas shoes? Do I order at the website with my regular EU size or with the 2 sizes lower (as recommended) in this website? Thank you!