No. We've got good news for you: you don't have to share with two different sites at all. Instead you can simply tick a box within your TISCreport account and our systems will share your statement to the Modern Slavery Registry automatically.
We have implemented this useful functionality as part of the UK Government Digital Service (GDS) directive to "Ask it Once" (we worked closely with GDS to develop TISCreport so that it would integrate directly into GOV.UK digital infrastructure and systems).