They are different model numbers as seen in the pictures but do work together.

Enhance your desktop computer's performance with this Crucial DDR2 SDRAM. This RAM pack consists of two modules, each with a capacity of 2GB, providing a total capacity of 4GB. The modules are certified for DDR2 800 PC2 6400 desktop computers and have a bus speed of PC2-6400 (DDR2-800).

The Crucial RAM pack has been tested and is in working condition. It comes with a lifetime warranty and has 240 pins. This RAM pack is perfect for upgrading your computer's memory and achieving faster speeds. Buy now and experience smoother multitasking and faster data transfer!