Don't know about Escorts, it depends on whether they are two speed fans or not which is likely (The Escos is), if so then no (Hey that rhymes)

I know lesser model Sierras and MK2 Fiestas have the same connector, in fact we have a MK2 and it has the same red switch as the Cosworth lol, most likely it was standard across Fords with electric fans of the era!

Martin