Filter by name for "Version 2", give those all a color label, clear the filter, make sure your Browser Metadata overlay is showing color labels, and sort?
Then "9" each of the images you want to delete.
Then either "Show all" or filter for just rejected images, review, and then send 'em to the trash.
Also useful might be to narrow the first search by excluding images which have adjustments added. Or limit to a date range that includes the time of the accidental duplication?
Lots of ways to narrow, mark, group, & sort.
Page 392, ff, in the User Manual covers the Filter HUD.
Bring it up by clicking the stand-alone button w. a white magnifying glass on a dark field. The button is just left of the search field at the top right of the Browser.
Click "Add Rule" to see all the possible sets of filter criteria. You can search on text using the "Text" Rule, or search on the Version Name as one of the drop-down selections in the "Aperture" Rule.
The easiest thing -- once you've grouped the mis-created images -- is to simply select all and delete. The only reason I recommended a longer route was to meet the requirement you specified: "ideally I would like to view these before deleting them". This seems a better plan. Aperture appends "Version #" to all newly created Versions, so it makes sense to be sure you haven't lassoed more images than just the ones you are trying to group in order to delete.