Are they correct depending on whether 'en' means it (singular) or them (plural)?
1. Pierre m'en a offert. / Pierre m'en a offerte. [Pierre offered some of it/them to me.](If COD/Direct Object - 'en' - it/them)
2. J'ai mangé des chocolats. --> J'en ai mangés. [I ate them.]
Are agreement rules applicable in Passé Composé for 'en' when it is a Direct Object Pronoun ?
The participle will always be in masculine singular with en since en does not carry gender or number information and always replaces an indirect object.
Pierre a trois fleurs. Il m'en a offert une. -- Pierre has 3 flowers. He offered me one of them. Even though fleurs is feminine plural, you still use offert and NOT offertes.
Note that usually you would add a number after the en. It is, of course, grammatically correct without une, but it's just less common. Similarly:
Il y a deux morceaux de chocolat. J'en ai mangé un. -- There are two pieces of chocolate. I ate one of them.
Il y deux morceaux de chocolat. Je les ai tous mangés. -- There are 2 pieces of chocolate, I ate them all.
Note how in the last example you agree the participle with the COD (les).
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