We are simply told that when he opened his eyes, he saw nothing. We might conclude from Acts 9 that Jesus appeared like a bright light. If we ask whether Paul's companions saw the same light, we would be dealing in the irrelevant. It does not matter what they saw or heard. The minor differences remind us to be cautious about reading too much into specific details that are not relevant to the main point.
Omissions are likely.
A greater difference is found in the presentation of Paul's commission. It is easy to see that both may be true. It seems that Paul has abbreviated the story for the benefit of King Agrippa. The importance is in the commission, not in the sequence of messengers or the location. In all these commissions, Paul is sent to gentiles and Jews.