Hi,
I have done a test in my SharePoint 2010 and I reproduced your issue.
It is by default that we can't distinguish Task Field with the same name one from other.
I created an approval workflow with a Task Field "Department", then created another approval workflow with a Task Field "Department".
Then go to create a new workflow, clicked Choose existing field, I was given both "Department" fields. I can't distinguish one from other.
To avoid that,I suggest that when you create a new task field, add task list name in front of the task field name. such as task list1-department, task list2-department.
As for whether it has improved in SharePoint 2013, per my test, it has the same issue.
Best Regrads,
Lisa Chen
TechNet Community Support
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