I am trying to understand why getRangeByIndex does not work when copy pasting from one sheet to another sheet

Here is the getRange script

`function main(workbook: ExcelScript.Workbook) {
    let temp = workbook.getWorksheet("Temp");
    let selectedSheet = workbook.getActiveWorksheet();
    // Paste to range A1 on temp from range F9:J9 on selectedSheet
    temp.getRange("A1").copyFrom(selectedSheet.getRange("F9:J9"), ExcelScript.RangeCopyType.all, false, false);
}`

Here is the getRangeByIndex

`function main(workbook: ExcelScript.Workbook) {
    let temp = workbook.getWorksheet("Temp");
    let selectedSheet = workbook.getActiveWorksheet();
    // Paste to range A1 on temp from range F9:J9 on selectedSheet
    temp.getRange("A1").copyFrom(selectedSheet.getRangeByIndexes(0,5,1,5), ExcelScript.RangeCopyType.all, false, false);
}`