When you start with your define.xml, your WhereClause ID can be whatever you’d like it to be as long as it is unique. However, when you convert using P21 Community, we regenerate a new WhereClause ID, which is where those extra characters come from, to ensure uniqueness and because the WhereClause ID has no significant meaning besides being a unique identifier.
Please let me know if this answers your question or if you have any further questions.
Regards,
Tom