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We simulated passing planetesimals through the circumplanetary disks of Jupiter and Saturn and capture of their material into the disks. We present the results of simulation for the comet material of the planetesimals. The conditions for disk capture of the entire mass of planetesimals are different for satellites. For material strength 2*10^5 >σ > 3*10^4 Pa a significant difference in the total masses of planetesimals with radii from 0 to 10 km capturing by the circumplanetary disks in the feeding area of Ganymede, Callisto and Titan is possible and could lead to a low differentiation of Callisto and Titan compared to Ganymede.