SWAP 1.4 TO 1.8T 20V

[Papuno]

Hello guys. Im doing a swap on a seat ibiza 6k2.

I have the engine AQX code and its harness.
I connected the harness inside, wich is all colors with the same colors (from what i saw when i was removing the 1.4 engine harness)
But i didnt change yet the ECU. It is still the 1.4 ecu
When i try to start the starter, so i turn the key to make it spin, it doesnt do anything, all i hear is the relays doing this bzzz sound.

Any ideas how i can fix this ? Please help

(No i dont want to buy a car, i cant afford it, plus i want this car, cuz love the car lol)

 

[Papuno]

bump ;-;

 

[bete noir]

Is there a reason why you still have the 1.4 ECU? I know nothing about the 1.4 ECU but even ECUs from different 1.8T engine codes have differences in pin-outs, so I would have thought an AQX ECU would significantly increase your probability of success.