"You wear a dress."
I chose the correct answer here which is "Nosisz sukienkę". However my question is about the pronunciation of many of the words here in Duo that end in "ę" or "a". This question is the perfect example. Before submitting the correct answer I first choose "Nosisz sukienka" and the pronunciation of "sukienka" sounds exactly like "sukienkę" to me. How does everyone else hear these words, the same or different?
No, they're not. The really identical pairs of sound in Polish, just differing by orthography, are: ż/rz, h/ch, u/ó.
a and ę are definitely different, and I don't think it's a common problem for the learners here to confuse them... a common one is to have problems distinguishing e and y.