If you are looking for the difference between the CGGP.25.4.A.02 and CGGP.25.4.E.02 from Taoglas Limited, the following information may help you.
Confirmed by manufacturer -
PN: CGGP.25.4.E.02
Description: GPS/GLONASS/GALILEO Dual-Band Patch Antenna 25254mm
PN: CGGP.25.4.A.02
Description: GPS/GLONASS Dual-Band Patch Antenna 25254mm
“E” – Has Galileo compatibility, but “A” – Does not have Galileo compatibility
Applicable Part Numbers
931-1126-ND
931-1472-ND
CGGP.25.4.A.02
CGGP.25.4.E.02