I think if the CCs are Rich Text CCs then the formatting of individual paragraphs is contained in the xml and therefore you can't format the contents differently in the two instances.

Instead, you will need to map the xml to a pair of Plain Text Content Controls and ensure both allow carriage returns. You can then style the two instances differently. The 'carriage returns' actually become line breaks (aka soft returns) so you can't apply different styles to different paragraphs within the CC.

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Andrew Lockton
Chrysalis Design, Melbourne Australia