Yes it can. In ECT you can apply filters at Ruleset level as well as Version level to see specific version level changes. Please refer to Page 13 in ECT Installation Usage Guide in the downloaded ECT package.
ECT does comparison of the rulesets those are listed under pxThread > pxSecuritySnapshot > pxUserRuleSets/pxUserRuleSetsLocalized. So, if you want to compare only specific ruleset versions, keep only required XML elements and remove the rest from the pxThread XML before uploading to ECT.