Can I Merge a Batch List-Item Selector with a Comparison List Selector?

I'm working on a complex UX that requires 2 discreet tasks to be accomplished on a list of items:

  1. Batch-Selection *of any items (for Archiving)
  2. Selection of only 2 similar items (for Comparison)

My current solution has these 2 features discreetly separated:

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The reason they were originally separated was that Comparing has some rules ( you can only compare 2 exact same URLs ) Therefore not all the items are selectable in the list, only valid comparable ones are: View screencast.

It would be ideal to unify both into 1 selection system, but my fear is that it would be even more confusing due to the comparison rules. Can this be elegantly done?

One possible solution:

1 - allow for any multiple items to be selected.

2 - if 2 are selected, then show both Comparison (if applicable) + Archive options

3 - if 3 or more, then only show Archive

COMPARE COMPARE ARChIVE ARChIVE

(option 1) downsides:

1- there are 2 Selector Columns.

(option 2) downsides:

1- The Comparison is not a feature clearly evident up-front in the UI until you select.

2- Rules are not evident until post-interaction, so if a user selects 2 random URLs, we would have to explain ( via alerts ) why you can't compare 2 non-identical URLs. ( which in option-1 is solved simply by disabling non-comparable URLs )

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