Answer
Two things commonly explain this kind of EE-vs-Aurena discrepancy. First, some Aurena screens require you to explicitly enter edit mode (using the pen/edit icon) before a field becomes editable, whereas IEE often allows inline editing without that extra step — check whether the record needs to be opened for editing first. Second, some fields that look like they belong to the record you're viewing are actually aggregated/rolled-up values sourced from a related child record (for example, some Work Order dates are aggregated from the underlying Work Task) — if a field isn't editable at the level you're looking at it, check whether it's actually sourced from a related record and needs to be edited there instead.