[viper1982]

I was observing that that 1 byte difference when trying to compare both .ROM in the Ecuedit generates an error saying that what I want to compare are of different sizes, so today I changed my ECU in the car, put the AE800 and read with the same method and program that the AE801PPP read. thus achieving a file exactly the same. And so we can compare the ae800 hand in hand with the ae801ppp in the ecuedit.
I upload the file in case it is useful to you.
Unfortunately in my possession I have only those two ECUs. But the AE800 is the same as the AE801 so there is no problem. The only one that would be missing if it were the case is the AE802.

I have no idea why my readings are 1 byte different from the ROMs that are going around the internet.