Simple. LCR parameters may be different, but so what. According to the theory this results in so little difference (to frequency response for example) that you need really 'bad' LCR measurements to get audible differences.

However, before you all turn into soppy subjectivists remember no DBT (ALMIGHTY) has ever shown differences in statistically repeatable tests; therefore there are no differences. You are all imagining it.

And very few DBTs (any?) have shown amp differences so there.....