Scenario 1 has 197k on a 16 year mortgage at 1.75% above ECB (3.9%) + 245k for 23 years at 3.2%. So obviously an interest saving on scenario 2 as there's 7 years less interest to pay!
Interest on scenario 1 = 170k
Interest on scenario 2 = 183k
A difference of 13k
If the tracker stayed at 0.75 margin, the interest difference would be 30k, but the extra 1% is costing over 16k in interest (16261.05 to be precise)
Why no go for a simple 20 year mortgage on the entire? - €2495/month. Total interest if the 3.2% rate applied for entire term 159k)
or avant 20 year fixed of 3.4% + 1% cashback - cost €2540 and will never change. (167k interest)
Scenario 1 has you paying €1340 (tracker based on current ecb + extra 1%) and 1255 for the 245k over 23 years. So 2595/month. Total interest 68k + 102k - 170k
So using the 20 year term for the entire sees less interest than the scenario one option.
Also remember you are paying about €1k a year on mortgage protection insurance.
This mortgage calculator is best for odd numbers of years -
https://www.calculator.net/mortgage-calculator.html?
Untick the "include taxes" box and reduce the "downpayment" to zero.