Not really all that different from prior pre-seasons so no, not worried about it all.
reminder of last seasons game vs Barc at the end of July
http://www.guardian.co.uk/football/2011/jul/31/manchester-united-barcelona-friendly-report
Manchester United (4-4-2): De Gea; Rafael (Fabio, 17), Vidic, (Jones, 76) Evans, Evra (Smalling, ht); Nani, Cleverley, Anderson (Giggs, ht), Young (Obertan, 62); Rooney (Owen, ht), Welbeck (Diouf, 77). Subs not used: Lindegaard, Amos, Jones, Ferdinand, Carrick, Park, Berbatov, Macheda.
Barcelona (4-1-4-1): Valdés; Dos Santos (Muniesa, 62), Busquets, Fontàs (Lozano, 73), Abidal (Balliu, 73); Keita; Afellay (Cuenca, 42), Thiago, Iniesta, Pedro (Espinosa, 86); Villa (Carmona, 62). Subs not used: Piqué, Puyol, Xavi, Jeffrén, Pinto, Riverola, Maxwell, Masip.