Согласно даташитам: 1622 product ME 1620 product CASIL

==============1622===========================1620= ==
1 K Backlight = Vss
2 A Backlight =Vdd
3 Vss Ground 0V =V0
4 Vdd Supply Voltage for Logic 5V = RS
5 Vo LCD Contrast Adjust By User = R/W
6 RS Register Select H: Data, L: Instruction Code = E
7 R/W Read / Write H: Data Read, L: Data Write = DB0
8 E HàL Enable Enable Signal = DB1
9 DB0 Data Bit 0 8-Bit Interface = DB2
10 DB1 Data Bit 1 8-Bit Interface = DB3
11 DB2 Data Bit 2 8-Bit Interface = DB4
12 DB3 Data Bit 3 8-Bit Interface = DB5
13 DB4 Data Bit 4 4 or 8-Bit Interface = DB6
14 DB5 Data Bit 5 4 or 8-Bit Interface = DB7
15 DB6 Data Bit 6 4 or 8-Bit Interface = A
16 DB7 Data Bit 7 4 or 8-Bit Interface = K

Ну и где у тебя там одинаковая распиновка?