Yes, it is (HWV 437 Sarabande)
According to "Can you identify cello and piano piece in last scene of Agatha Christie ABC Murders (v. 2018 John Malkovich)?" on MusicFans StackExchange, it is "part of the second movement of Franz Schubert's Piano Trio in E-flat major (D.929) arranged for cello and piano (originally for violin, cello and piano)."