This is a question that comes up an awful lot ... to answer, one would have to overlay the impedance curves of the speakers. It may well be that the dips do not correspond with one another.
If you're after a fully balanced preamp to complement your 452, then any of the Mc 2-chassis preamps fit the bill. C100 & C200 have a pair of tape loops - one balanced, one single ended.
IMHO, try what you already have first ...
In 1945, vehicle's owners manuals gave precise step-by-step instructions on setting valve lash. Now, it says not to drink the liquid in the battery. But, yeah we can stream tik-tok videos faster than ever . . . that much is true.
Much mystery about the nature of the black faced 2300s ... we may never know. I never saw a pic of the studio installation, just connected with the man who salvaged what he could from it before it was leveled.
Let's say that you had two high quality DMMs and the tools to capture peaks down into the milliseconds - one records RMS Voltage and the other Current of the amp's speaker output. The product of those readings, captured at the very same point in time, is not power when driving anything but a...
There was just such a studio in CA that had ten such black faced 2300s and numerous 2105s - a fire destroyed the place.
I tried my best to buy some of the amps but the divorce ... well ...