Timbre difference, choir 2?

I have to verses with what I believe have the same settings at the beginning. Yet, the secound sound much brighter…… I must be blind to not see what makes the difference. Would very much appreciate if someone can have a quick peak.

Thanks, robert

Couplet 1 wav

Couplet 2 wav

Couplet 1 song

Couplet 2 song