It's a different amplifier.Sorry, same amp with different output/driver stage and bias change.That allows one to directly compare same amount of Mosfet devices to the same amount of BJT devices
Can you even buy TO3 transistors any moreOf course you can don't be an *****, and they're still cheap and plentiful, just look around.https://www.ebay.com/itm/1pairs-OR-2PCS-Transistor-MOTOROLA-TO-3-MJ15003-MJ15004-100-Genuine-Origina...
End of story, no more on this as it's not about the title "new GaN Amplifiers"