There are a lot of options when converting a style from one board to another that it is truly impossible to use this sort of test for a true assessment of keyboard sound quality.
Firstly which manufacture did the original style come from. If it was converted with EMC then all volumes, Reverb\DSP & Panning are not converted and set to default, so the style would have to be tweaked to sound acceptable differently for the Tyros & G70.
This is interesting but no ground basis to make a judgement.