About WhatsApp Emojis
WhatsApp has its own emoji designs which are displayed on all WhatsApp for Android and WhatsApp Web.
One emoji supported by WhatsApp but no other platform is the Texas Flag emoji. This is a valid subdivision flag supported by Unicode, but not listed within any Unicode emoji release and as of 2019 is not supported by any other major vendor.
Support for Emoji 13.0 is now available in beta releases of WhatsApp, coming to a public release in late 2020 or early 2021.