The sight of Michael Carrick turning to Joshua Zirkzee to rescue the Manchester derby, while Enzo Maresca sent on Iliman Ndiaye at half-time, was an illustration of the different landscapes at Manchester United and Manchester City.United have been trying to sell Zirkzee all summer, while City signed Ndiaye for £65m, instantly switching targets having been thwarted in a bid for Liverpool’s Cody Gakpo.Zirkzee is a good, technical player, but had nine goals in 76 appearances before Carrick beckoned him from the bench to replace Marcus Rashford with seven minutes left at Old Trafford. His future was viewed as being elsewhere at the start of the summer but United were unable to attract the relevant interest.Ndiaye, meanwhile, was wanted by Tottenham Hotspur, but City pounced and at Old Trafford Maresca substituted him for Rayan Cherki to get a greater output off the ball from his right winger, with his team down to ten men after Phil Foden’s first-half red card.It was Ndiaye who robbed possession from United when Patrick Dorgu’s miscued header failed to reach Harry Maguire, starting the move that led to Erling Haaland’s solitary goal. Zirkzee’s most notable moment was an overhit cross.You imagine Zirkzee will have positive influences this season, and Ndiaye’s form will inevitably dip. But the wider point is that City have enhanced Maresca’s squad with financial muscle and tailored additions, while the work done in United’s window for Carrick was modest.