Different, but not contradictory. There are many contradictions in the Bible, but these aren't two of them.
True, it's not a big difference, but it indicates that Matthew is the original account. Matthew uses exactly the same pattern for both the bread and the wine:
Jesus
Took bread
Blessed and broke it
Gave it to the disciples
Said, "take, eat, this is my body"
Took the cup
Gave thanks
Gave it to them
Said, "drink this all of you, this is my blood..."
Mark however, follows the same pattern but breaks it by omitting '...eat...drink' and inserting 'and they all drank of it', with Jesus explaining what the cup represents after they have drunk from it.
If you had two versions of a rhyme, and in one version the pattern was broken, you would assume the intact pattern belongs to the original version.
I guess this could be relevant to the thread in the sense that we see in Matthew what is probably a liturgical form of the account, being therefore a more accurate representation than Mark's of how the Eucharist was originally practised.