How to compare the roles where created or defined in two different systems?

For role comparision both the roles must be in the same system, in same client

Transaction code SUIM -> Comparision-> Roles

If the roles are in different system, then tranport the role into one of the system and do comparision.  If no transport connection defined then, you can use the upload and download option in the PFCG 

Steps for Role Comparing:

1. Run the t-code SUIM

2. Go To Comparison and select the option of roles

3. Click on Across systems option it will give option to select the sys name under Remote Comparison there enter the SYS ID between which system you want to do comparison and put the role name in compare role section then execute it will give you the result.

4. If there is any difference b/wn the t-codes it will b in red colour otherwisein yellow.     

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