An A2 I bought last year came with "stance street" lowered suspension. Made it handle like a dream, really stuck with hardly any roll, but I'm over 50 so changed the suspension to Bilstein B4 and normal ride height. I still have the suspension I took off it which I believe had been on for less than a year. The Stance suspension was set at the higher end of it's range as the car had 17" wheels, so it was only lowered about 35mm. The Stance kit as fitted to the car came with adjustable drop links which despite the relatively modest lowering were set at 220mm.
Conversely to this direct experience, the Stanceduk website (kit 1072) states that any lowering greater than 40mm would require their adjustable length drop links. This implies that your intended 25mm lowering would be fine with original drop links.
Other than obviously affecting the roll characteristics, I am not sufficiently schooled in suspension set up to know whether a shorter drop link would be beneficial with a modest lowering.
In summary, yes you will be fine with original droplinks with a 25mm lowering, but you MIGHT (and I stress 'might' because I'm guessing) be even better with slightly shorter drop links.
Trevor