Some NV Champagnes, particularly certain soleras, list the disgorgement date. Perhaps dome other sparklers do, as well. Certainly, there are still solera-based wines that list bottling or vintage dates or otherwise give a market as to which bottling they are
FWIW, though, I haven’t found extraordinary variance in most NV sparklers when comparing disgorgements near in date to one another. Selosse is probably the most extreme in difference I’ve come across, but I’ve never had a Selosse I didn’t love.