In mid-year 1982, the composition of the cent shifted from a copper-zinc alloy (weight 3.11g) to copper-plated zinc (weight 2.5g).
If the plating bath isn't changed frequently enough, the solution gets zinc poisoning and will have a brassier coloration.
It's just a meaningless variation in the manufacturing process.
You certainly could brass plate a cent, but why would you?
-----Burton
50+ year / Life / Emeritus
ANA member (joined 12/1/1973)
Life member: Numismatics International, CONECA
Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club
Owned by three cats and a wife of 40+ years (joined 1983)
Author: 3rd Edition of the Sample Slabs book,
https://www.sampleslabs.info/