CV73 / KT44 valves

[Andy M0FYA]

According to the National valve Museum website "The KT44 beam tetrode on a B7 base is described for both audio use and television line output service. In the television role the valve can withstand a positive anode surge of 8,000 volts. The KT series are mainly known, however, as audio devices. The KT44 is a four Volt version of the KT66 with the anode connection taken to a top cap so that the valve can withstand high peak anode voltages"
So I wonder if an o/p transformer specified for a pair of KT66s would be correct for a pair of KT44s?
Has anyone seen the load resistsnce specified for a pair of KT44s in, say, a Williamson circuit?
Andy