Ferrite beads are specified by its impedance at 100 MHz and at least DC current rating. Be aware that impedance reduction due to DC saturation starts far below the rated current. Respectively the ethernet supply filter bead should have at least 500 mA, better 1 - 2 A DC rating. Suitable impedance range is 120 to 600 ohms.
Reviewing recent datasheets, PIC18FxxJ6x series seems to have an EMI problem, thus additional Tx low pass filters are suggested that are missing in previous versions. Probably no problem for a hobby design.