Yes. EU regulations allow an address of an established FBO in any EU27 country to be used anywhere in the EU.
Is it permissible to apply dual labels that have both a name and address in the EU and a name and address in the UK?
Yes, a label which carries both the addresses of an FBO responsible for the information based in the UK and one based in the EU27
What will the Food Business Operator address requirements be for food exported from the UK for sale in the EU27?
After the end of transition, prepacked foods sold in the EU27 must include the name and EU/NI address on the label of either the responsible
This will depend on the legal relationship between the two companies. It is recommended that businesses in this position seek their own legal advice and