What's the difference between threepence and tuppence?

Threepence

Definition:

Example Sentences:

(1) Wanting to help the stretched family finances, she became a secretary, devoting rare threepences to buying "late doors" tickets sold five minutes before curtain-up at local theatres.

Definition:

Example Sentences:

(1) As a book, it wasn't worth tuppence, but I'd had it all these years.
(2) They had no money of their own - as my mother would put it years later, "They had tuppence ha'penny.
(3) Through that labour I learned that when a society is dominated by a minority of wealthy people, the hopes and dreams of the majority aren’t worth tuppence.
(4) While being a hot actor means that bandmates Emre and Mikey probably have to get changed in the loos and stand at the back during photoshoots, at least having Olly in the band means he can call up his famous mates (Ben Whishaw, Black Mirror’s Tuppence Middleton, Utopia’s Nathan Stewart-Jarrett) to lend their videos some genuine dramatic heft.
(5) If they have the right system, they might be able to do a page layout, but all the relevant parties can't look at it together, putting in their tuppence-worth and coming to a conclusion then and there.
(6) Despite spending only "tuppence" in the transfer window and losing 16 players in the summer, Paul Ince has moulded a niggardly side; they had conceded only two goals in the league and kept three clean sheets before this fixture.