FRANKFURT/PARIS (Reuters) – Holcim Ltd (HOLN.VX) and Lafarge SA (LAFP.PA) have agreed to new terms over their planned multi-billion-euro merger, which would create the world’s biggest cement firm, including agreeing to a new share-swap ratio for the deal. They agreed to a ratio of 9 Holcim shares for 10 Lafarge shares, Holcim said on Friday. It said the appointment of a new chief executive for the combined group would be communicated in due course, at the latest upon filing of the public offer to the Lafarge shareholders.