There has definitely been some character and time compression so far, comparing this season with the books. Members of the Brotherhood without Banners have been condensed. Clearly, we've seen Thoros of Myr and Anguy. But no Lemoncloak, Harwin or Tom of Sevenstrings, so far. But then we did see Thoros singing, in something of a nod to Tom.
And the Brave Companions? They haven't been clearly established, either. Although this character "Locke", played by Noah Taylor does seem to be a stand-in for Vargo Hoat.