Yes, you can use the same context.
version: 2.1
orbs:
auto-cancel-workflow: ganezasan/auto-cancel-workflow@0.0.6
workflows:
version: 2
auto-cancel-example:
jobs:
- job-1
- job-2
- job-2
- auto-cancel-workflow/auto-cancel:
context:
- mycontext
More info on contexts: Using Contexts - CircleCI