Details of the resurection account differ from each account. In Mathews version of the gospel the two Marys go to visit the tomb. The see the tomb which has a angel sitting on the rock who speaks to them.
In Marks account we see three women go to the tomb. In this acocunt they notice the rock rolled away however do not notice a angel sitting on the rock and only notice a man on the right of the tomb once inside the tomb.
Matthew was the only Evangelist to talk of an angel sitting on the stone because he was also the only Evangelist to relate how the Jewish authorities got the tombtone sealed and secured in order to prevent the fulfillment of Christ's prediction. http://answering-islam.org/authors/masihiyyen/rebuttal_paine.html
Lukes account states that women went to the tomb - this ticks the right box and agrees with both the above as it does not specify. Now it is only after they enter the tomb, do not see the body, they begin to wonder where the body is - it is only after this point that two men appear to them. So no mention of a angel sitting on the rock, or no vision of this person once inside but after a certain time period has elapsed in the tomb. A litttle different from both the above.
This is because Luke did not follow Mark's and Matthew's outline. If you read all the Gospels carefully, you see that Matthew's account is more similar to Mark's whilst Luke's to John's. These four Gospels can be divided into two groups of two. Notice that an angel of the Lord in Matthew and Mark told the women that the disciples would see the risen Lord in Galilee whereas in Luke and John's accounts risen Christ appeared to His disciples first in Jerusalem!
We can infer that the men in white/bright clothing in Mark and Luke were angels although Matthew explicitly used the word angel probably because he also recounted how the tombstone was rolled through a divine intervention and manifestation.
In Luke and John the number of these men talking to women was said to be two in contrast to the one reporter in Matthew and Mark. This was probably because Luke and John wanted to associate these messengers with the fact that Jesus had sent His messengers two by two. More, two people's testimony were required in Judaism. Note that in Acts similarly two men appeared to the apostles at the time of the Lord's ascension.
In Johns account - Mary goes to the tomb, sees the empty tomb yet no mention of any communication with anybody about what has happened to Jesus instead she runs back to the desciples. The 3 desciples run to the tomb see it empty and leave for their homes. Mary is outside weeping and eventualy looks inside to see two angels.
First, there were two different groups of women going to the tomb. Second, John did not say that only Mary Magdalene went to see the tomb. While informing the disciples she said "WE do not know where they laid the Lord's body". Third, John the Evangelist wanted to relate Jesus' first appearance from Mary Magdalene's perspective, making her play the leading role. Her male counterpart among the disciples was Thomas.