These are all identical (19.0V DC 4.74A, 90W). Genuine parts, taken from Logik laptop power adapter sets. Tip 16B for Lenovo, IBM. Tip 33 for Lenovo. Tip M for Acer, Asus, Clevo, Compaq, Fujitsu, Hitachi, HP, IBM, Lenovo, NEC, Panasonic, Sharp, Toshiba.
