Most famous Platonists were vegetarians even when they performed sacrifices as a necessary evil. There were alternatives, like cakes baked with the shape of animals. Not all Christian views and doctrines have a counter part in Greek philosophy, some have actually opposite views.
On one side Christians end up being the ones putting end to animal sacrifices (even though they still occur rarely in Christian populations as surviving pagan customs), but utterly rejected the idea of compassion towards animals that had been building among Greek philosophers.
As an example, from the Neopythagorean Apollonius, being familiar with the Bible you may see the differences:
[1.8] Now Euxenus realized that he was attached to a lofty ideal, and asked him at what point he would begin it. Apollonius answered: "At the point at which physicians begin, for they, by purging the bowels of their patients prevent some from being ill at all, and heal others."
And having said this he declined to live upon a flesh diet, on the ground that it was unclean, and also that it made the mind gross; so he partook only of dried fruits and vegetables, for he said that all the fruits of the earth are clean. And of wine he said that it was a clean drink because it is yielded to men by so well-domesticated a plant as the vine; but he declared that it endangered the mental balance and system and darkened, as with mud, the ether which is in the soul.
After then having thus purged his interior, he took to walking without shoes by way of adornment and clad himself in linen raiment, declining to wear any animal product; and he let his hair grow long and lived in the Temple. And the people round about the Temple were struck with admiration for him, and the god Asclepius one day said to the priest that he was delighted to have Apollonius as witness of his cures of the sick; and such was his reputation that the Cilicians themselves and the people all around flocked to Aegae to visit him. Hence the Cilician proverb: "Whither runnest thou? Is it to see the stripling?"
He also justifies his prescience regarding the plague with his diet:
[8.5].... The third question related to the plague in Ephesus: "What motived," he said, "or suggested your prediction to the Ephesians that they would suffer from a plague?"
"I used," he said, "O my sovereign, a lighter diet than others, and so I was the first to be sensible of the danger; and if you like, I will enumerate the causes of pestilences."
But the Emperor, fearful, I imagine, lest Apollonius should reckon among the causes of such epidemics his own wrong-doing, and his incestuous marriage, and his other misdemeanors, replied: "Oh, I do not want any such answers as that."
Philostratus, Life of Apollonius