Help with Maggie Consoles re: Impedance

I caught the rockin-consoles-for-free bug and have 5 Maggies now.

I'd like to know if the 60's and 70's used the same impedance for the speakers.
I'd like to swap the 10" w/horns from a 1970 Astrosonic into a 1965 Magnasonic with 12's & pairs of 4" mids.
The bass is tight on the 65 but there's no highs, just midrange.
The 10's w/horns sound way better.
I'll try them with the consoles back to back and the 65 feeding the 10's to make sure the dead highs are the 4s' limits & not the electronics.

I looked around here & AK but can't find any useful Ω info.

Thanks

BTW - It might not matter but I rock everything from Funkadelic to Metallica to Muddy.Wolf to Lil Feat to Zappa to Beethoven to Kitaro to Miles to Zeppelin to...I have a few hundred good Classical records and am building my rock collection.
I have a replacement stylus OTW for the 65

As long as too much power is not fed into them, the speakers from almost all stereo systems are electrically interchangeable.

Anything within a range of 4 to 16 ohms will work. Only tube amps are really fussy about impedance.

How it sounds is a different issue. Speakers must be matched with their enclosures to sound good.