Oddly enough, it does happen, WhatsApp for Android is updated on a Saturday, and this time updates both its beta versions as stable. On the one hand the stable version of the application in Google Play is updated to the new version 2.16.310, while its beta version is updated to version 2.16.311, in both cases without apparent novelties, we could not even say that it is updates to fix bugs, rather the produce.
Regarding the internal version of the stable version of WhatsApp for Android is necessary to comment that your installation file APK has increased 217 KB, with 793 modified files, of 787 which correspond to optimizations emoji and icons, the other 6 files are to manifest and other files needed to increase the version number.
The internal version of the new Beta of WhatsApp for Android is almost identical to the stable version, because although its installation file APK has decreased by 207 KB, have modified 956 files, among which are 947 emoji and icons, no files refers to any function of the application, as in the stable version. Please remember that if you want to become a beta tester of the application from Google Play, you have all the information here.
Descargar | Google Play (stable version)