Can you tell if it’s UHT milk?

I live in a country experiencing a boom in third-wave coffee shops and standards are now high and rising all the time.

But friends visiting from an Antipodean country with exacting coffee standards noticed that in all the coffee shops I recommended, baristas were using UHT milk, not fresh. (As an oat-milk drinker, I’d never realised.)

So I’m wondering: in the finished product, is the difference noticeable?