You would need to be sure to sign any needed paperwork and follow their procedures to sever your pledgeship with the original sorority.
And please note, not every NPC group uses the term "founding member" so it's best not to use that term unless you are sure. As far as my group is concerned, we only had 3 founders in 1873 and they are dead and buried in MS. We use the term "charter member" for the members of the first group initiated in a new chapter.
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