The model # & make of the console wld solve the info dilemma quickly,
as most schematics are freely available.

6BQ5 has also been used with rather high load Z's for lower-fi
applications at lower pwr, like radios. And a consumer console might
run 2x4z spkrs in parallel.

If someone gave or sold you 2 carbs from an unknown Italian car, would
you expect 'em to fit your Alfa? ;-)