Is it permissible for me to pray according to the recitation of Hafs from Asim behind an Imam who recites according to the recitation of Warsh in Morocco?

There is no harm for the ma'mum (follower in prayer) to recite with a riwayah (narration) other than the one the imam (leader in prayer) is reciting with. So, if the imam recites with the narration of Warsh, for example, the ma'mum is not obliged to follow him in that, and he may recite with the narration of Hafs.