[pecirepi]

you have few options.
to check ecu type edc16u1, u31 ...
if same type of ecu then you have options to make clone of your ecu to new used ecu, with this option you will solve all problems with coding and other stuff. but for this option you need to have tool which can clone that type of ecu.
next thing is to send here eeprom from old ecu and new ecu, so we can check ecus.
third thing is to disable immo in eeprom and to use vcds and to read original codings from old ecu and to recode new ecu with original numbers.

it is up to you to decide and to told us what kind of tools you have so we can help you.