Can I use the same restic cache directory for two different repositories? or do I need to provide two different cache directories, if I have two different repositories.
You can. Restic doesn’t mix something up here.
This is also documented here: Local Cache — restic 0.16.4 documentation
If the information there is not sufficient or hard to understand, please let us know how and why and we can see if it needs tweaking. 
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