Do individual plants vary? They do! For instance…
I’m the one who came to your store today looking for Echeveria ‘Blue Bird’. Attached is the picture (of the plant) I bought from you last August. It looks different from what you showed me today.
I agree it looks a little different, but it’s the same plant. Plants are individuals and there is natural variation, plus your growing conditions and ours may be different.
But it is the same species.
Here is the Echeveria “Bluebird” that Fred saw at the store this week:
Very similar? Not the same? It’s the same species after all!