Use Ionic 4 icons with an Ionic 5 app?

The ionic icon set comes packaged by default with Ionic 5. Does anyone know if you can revert back to the Ionic 4 icon set in an Ionic 5 project, or is it mandatory to use the Ionic 5 icon set?

Asking because of this issue we are having with Android 8.1 devices and the latest version of Chrome.