The family look up table shown here will help confirm the specific device you are looking for, but it can be greatly simplified by remembering that the key differences between the devices are Flash and pin count. Both can be quickly deciphered from the Part number. The part number begins with PIC24FJ which is a 16-bit entry level PIC Microcontroller. The Flash memory size immediately follows the FJ in the part number. The G indicates that the device is general purpose. In the future other designations will be added to match the feature set. The A0 are used to identify specific derivatives. The last two digits are a rough indication of the number of pins divided by 10. For example an 06 is 64-pins, 08 is 80-pins and 10 is 100-pins.