Can I compare the traces of two scenarios?

REVEN does not provide such a functionality out of the box for now.

Still, you can build your own trace comparison using the Analysis API. It requires:

1. finding the region of interest (symbol, process, etc),
2. parsing both traces with the Python API and outputting instructions, values, that you deem necessary into separate files,
3. creating a comparison of those output files.

See https://blog.tetrane.com/2019/11/12/pe-parser-crash.html for an example of such a script.

You may also want to compare taint outputs, since those are accessible through the API as well.