I find that currently, most "Broadway" voices are very much alike in timber, color and size. I have a very hard time differentiating one voice from another on recordings without looking at the listing on the label. This is not being critical, it's just an observation. I suppose this makes it easier to replace people from one cast and another . That being said there are many performers whose style and techniques that I admire enormously, I still don't find very much difference between one voice and another. There are a few (Judy Kaye, LuPone, Peters, Esparza), but they are few and far between.
Just my opinion, I may be wrong.
TWOGAAB
"A Class Act" will never die!