magento2.2 – How to replace the adminhtml template in magento 2 for a specific website with a multi-site feature?

If you have a block php file defined for this template, you can define a template in a block file.

protected function _construct ()
{
parent :: _ construct ();

if (site1)
$ this-> setTemplate (& # 39; Vendor_Module :: tpl1.phtml & # 39;)
if not (site2)
$ this-> setTemplate (& # 39; Vendor_Module :: tpl2.phtml & # 39;)
}