Question about Synology Ds218+

Hello I intend to purchase a DS 218+ or 220+. For this I would like to use "Synology Drive" and "Synology Office". Question: Is the "Spreadsheet" tool the same as XLS from MS Office (formulas, formatting, etc.)? Can files created with "Synology Spreadsheet" be converted to XLS without losing formulas or formatting? Can files from "XLS from MS-Office" also be converted to "Synology Tables" without loss of formulas and formatting. Many thanks for feedback