I might advise you to leave the fact that you were in a local out of your conversations simply because there might be confusion among NPC actives just like the confusion you (and I!) had over this. I could see that a random comment about being in another sorority might throw someone for a minute.
BUT, I don't know anything about your campus and local orgs and related rules governing pledging others might be common knowledge there. It is not anything you have to hide, but as Violetpretty said, it doesn't need to be the first thing out of your mouth.
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