The Edge version in Perfecto clouds is determined by EdgeHTML version and not Edge version.
Current Latest EdgeHTML version is 16 18 which is corresponding to Edge version 4244.
EdgeHTML is a proprietary layout engine developed for Edge. It is a fork of Trident that has removed all legacy code of older versions of Internet Explorer and rewritten the majority of its source code to support web standards and interoperability with other modern browsers.
EdgeHTML is meant to be fully compatible with the WebKit layout engine used by Safari, Chrome and other browsers.