What we tend to see is Epicureans adapting the ideas of others, but refashioning them so that they slot in to the broader framework of Epicureanism.
The Empedoclean view of the principles of Love and Strife as ethical forces of nature was not found suitable, but the Lucretian refashioning of this idea into the metaphorical Venus and Mars of atomic physics was useful to him as a didactic poet, so he used it.
His borrowing of the account of the plague in Athens from Thucydides might have followed a similar course, except that the poem ends abruptly.
And DeWitt points out somewhere that Epicurus was capable of enlisting Homer in his defense if it came to it.