"pence" is simply the plural of penny in the British system and is used for any multiple of coins worth 2p or more.
However "pennies" refers to a group of one-penny coins.
The usage is a bit strange. If you have 10 one-penny coins, you have 10 pennies that are worth 10 pence! If you had one 10p coin, it's said to be worth 10 pence.
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