Hellos - Been awhile since my last post.

So I still have my CRD - since 2015 -

The past month I have been having starting issues, intermittent at first, but the starter would not engage. Sometimes it would work, other times not.
I changed and checked all the regular stuff - ignition switch, security module, all the sensors on the transmission, the starter itself. I finally had to take it to a shop [the labor will be allot]. The tech traced all the possible paths. ALL good. The problem seems to be in the ECU. I dont understand it, but that is what they say.
I had a backup ECU that I bought in 2015 when I did the tune [forget the company]. Bought through ID-parts I think??
So, Has anyone had this problem? They tell me there is no fix for the issue, that sending off the the current ECU may not even fix the problem. So I gave the shop the ECU Ive had sitting in a box all these years.
Is it correct that the CRDs ECU is part number specific? Does it go off the VIN? ..or the number on the old ECU?
I am worried that the tune I input will no longer exist [of course].
Is changing the ECU as easy as swapping it out? ..so many problems... TY for the help [anyone] TY

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2005 Liberty 2.8 CRD

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