Ral,
with transformer coupled amplifiers, the transformer is what the speaker 'sees', and the tubes 'see' the transformer also; thus the different circuit topology may affect the "sound" the power transfer should not be effected. Given your illustration, the MFG probably used the same transformer, just took different taps, and the sound will be similar either way.
with transformer coupled amplifiers, the transformer is what the speaker 'sees', and the tubes 'see' the transformer also; thus the different circuit topology may affect the "sound" the power transfer should not be effected. Given your illustration, the MFG probably used the same transformer, just took different taps, and the sound will be similar either way.