Two accounts of the same subject can disagree in ways that deserve closer attention. Before merging them into one smooth summary, identify what each account says and the material on which it relies.
Choose a specific point for comparison. Record the relevant passages with their references and note whether the difference concerns a fact, an emphasis or an interpretation. These are different problems and may require different kinds of further reading.

Look at the surrounding argument rather than extracting only the most striking sentence. A passage may answer a narrower question than the one you brought to it. Explain that mismatch before deciding that one account contradicts the other.
Your written comparison can preserve the disagreement when the available evidence does not resolve it. A clear explanation of competing interpretations gives readers more to work with than a compromise that neither source actually supports.