FNP-9 FNP-40...TO Decock or not?

[jece]

THE FNP-9 USG comes without the decocker, the flat dark earth frame color, which weights 25.5 oz. The other models come with the decockers wether you want one or not and weight 25.2 oz. The FNP-40 USG comes without the decocker and weights 26.7 oz. Is the difference in weight the lack of the decocker and the beef-up slide on the 40 cal. slide? I thought the FNP-9 AND the FNP-40 were basically the same pistol.