The CD4027 is a CMOS based high voltage high speed Dual JK Flip-Flop package. The Flip-Flop could typically operate at a speed of 16MHz even at high voltages like 15V with a low noise margin of only 2.5V.
The CD4008 is a high speed, high voltage 4-bit full Adder IC with carry out feature. The IC has four independent stages of full adder circuits in a single package. It is commonly used in applications where arithmetic operations are involved.