The Belt might well be the same.
Other components being replaced are not the same.
Yes there were and are 1.4 TSI and TSI ACT, and 1.5 TSI non ACT and 1.5 TSI ACT across the 4 brands.
I have not heard from anyone's mouth or heard or ready anyplace of any catastrophic failures or issues other than from the work being done and wrongly.
That is an issue.
So what we need is THE CAR MANUFACTURERS RECOMMENDATION,
That is VW, SKODA, SEAT or AUDI, and then you might have the Importers recommendation, guidelines, specification or schedules in writing.
Get it from the horses mouth, get it in writing, get it confirmed exactly what is required to be done when in the UK if it is a UK registered car with an Extended or Used car Warranty.
The OP has pretty well tried to get the info, has the info from a source and that might or might not be worth the paper or screen it is written on.