REGCMI,
Yes any 2 Bank EECV, all the Cosworth V6 ones, (except the mythical very late 98 one that no one has seen, as I suspect that is 256k), can be flashed with a bin from the others.................I have an EXIT with a FILM calibration in it

Dave,
Hear you but its not all doom and expense

I didn't buy a QH cos it hangs out the back of the ECU, what I bought was Moates Burn2 and a J3 adaptor, with which we can read all EECIV and EECV bins.
With that we can reflash J3 "add on" chips which are $60 a go but these too plug ino the ECU, no biggie for the first one to make sure we got it right

After that the utimate goal is to Reflash the ECU chip, which can only be done with Clint's Binary Editor, thru OBD port but that does require the Mongoose lead...........£450 brand new.........It's the same lead as used for Jaguar / Landrover so I may pick up a s/h one in due course and we don't need that until we are ready to do multiple ECU's, flashing their internal ROM chips.
Up until now I have been using the cheapo $30 Tunerpro software, but as we found out it is quirky on some bin reads and won't reflash ECU Chip.
EEC Geeks are all using Clint's Binary Editor, which does all sorts including Datalogging and reflashing EECV via OBD.
I've played with the test version and it really is a tool

The software costs $100 (about £67), but you cant reflash anything until you buy the hardware option (dongle at $60), so I've now bought the software and dongle yesterday................Cheeky git did rush me an extra $23.95 on top of the advertised $11,for postage to UK tho

So now the only other purchase to be made is the lead, which I don't need until I am ready to reflash the internal ROM and the def file which either we will do slowly or will purchase as per title of this post

Once I have a working file all I need is the $60 J3 chip from Moates to try it out on my car, to see if it is all working, that's why I'm just going to change the Transmission and Fan On / Off's for now, then the Puma will run on EXIT with it's BOB Fuel Map and VIS

Once that works I'll Expand the def and try adjusting / deleting more

Then it's time for the Mongoose and reflash my internal ROM Chip

After that, to do anyone elses I just buy a token each time if needed, but they may not be needed as it's the same bin file

So yes if we add it all up, it is expensive on one off payments, but I've been purchasing all this stuff each time I have a busy week, so tbh haven't missed the cash
Using an aftermarket ECU was never an option for me............
1) And most important, I want to learn this as a new skill. I'm not getting any younger, and to maybe be able to diversify into reflashing ECU's in a few years time would be better than humping gearboxes and axles around etc :)
2) We all know the EEC ECU's are far more capable than the aftermarket stuff, so it makes sense to get our heads around them

So really even if I spend a grand, plus the def, it doesn't really matter as I'm learning all the time atm

Guess that's why I'm always skint

Enough sh!te for now.........Got to go build a WRC Focus gearbox now lol.............B.F. that car goes like the clappers, road tested it yesterday

Cheers for now
Dave