the 1.4 ECU will run the 1.6 no problem. The timing tables are similar.
You'd just have to be careful it doesn't run too lean at WOT, as obviously the ECU will inject a 1.4 engines worth of fuel instead of 1.6.
So if you've created your own tunes, for engines and no musical ones, then you should be fully aware of the effects of using an ECU tuned for a 1.4 engine on a 1.6.
just to make you aware, locked/unlocked ECU has nothing to do with the ability to read/write data to the ECU. When people refer to a "locked" ECU they're referring to the immobiliser.
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The rain kept a trollin'
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