Difficult to tell in a photograph, if the mark is slightly raised it is probably burned.
You probably not find a substitute, in an ECU the parts are usually custom made or are generic parts specially programmed to perform a specific job. You could try contacting the ECU manufacturer but I doubt you will find anything using the part number.
Thanks for the datasheet. Can I find a supplier in Europe? So that I can have the part in Portugal next week? All the suppliers that I came across where outside EU and with large delivery times.