It might be easy. Export both your ELR recipes and your e-Juice me up recipes to two separate .CSV files. Open them both up in Excel or other spreadsheet app.
To import your ELR recipes perform a “Save As” on the ELR.csv to make a 3rd working file, and edit the top row “Headers” to match the e-juice me up export.csv. Delete any columns in your 3rd “Save(d) As” spreadsheet that are not visible in E-J-M-U.csv and add new columns for the ones that DO exist …you might be able to just rename but blank out (del) any data below (new columns) if it doesn’t match with the Header.
This new 3rd spreadsheet should now have all the same columns/headers as the E-J-M-U.csv and correct data underneath …uh hit SAVE. Then you can import or just rename (must be a TEXT format .CSV) into e-Juice Me Up. If the .REC format is proprietary try opening it in a TEXT editor or let Excel take a crack at a straight Data Import from the .REC to uncover the database format (commas, TABs?)