Exporting Eligibility Matrix containing only updated Eligibility rules

Hi,

We want to export eligibility rules through matrices. As per my understanding first time we can migrate the matrix containing all rules, from one environment to another through ADM.

Now,next time when the Eligibility matrix is updated with some new or updated rules, our requirement is to export only the ones which have been newly added or updated from base to the target environment.

As the Eligibility matrix name has different BC and the rules have different,what kind of filter we will have to apply in ADM, in order to migrate the Eligibility Matrix containing only the updated rules.