It could be... because Morata is likely to improve...
But you realize you called the difference between a 38 goal striker and a 12 goal striker, less than between two mids Pogba with 10 goals-15 assists, Pjanic with 12 goals-13 assists.
Of course there are other differences between Morata and Higuain, and Pjanic and Pogba that change this comparison a bit... But as things stand today, Higuian + Pjanic > Morata + Pogba and it's not that close.
The future... that could change drastically. But as of today. No way.