[geoff]

Mr.T wrote:
adjacent speaker, and match the resistance to within 1% or so.


Which contradicts your premise since the drivers are different and the
resistors would have to be matched to THAT driver IF you think it's
THAT critical.
The only way would be to properly test it, which is obviously beyond
the OP.

The original pair of speakers would be matched to around 0.5dB. Why not do
it right, or get somebody competent to do it ?

geoff