No. There's no difference at all. These two words are pronounced in exactly the same way.

In American English, these words share the same pronunciation.

Thank you for your explanation Su.Ki.

There is NO difference. It's a very common non-native mistake to pronounce 'son' to rhyme with 'John'. This is wrong. In fact, the 'o' sound in 'son' is the same as the sound in 'sun' or 'fun'. This same 'uh' sound in 'sun' - written as /ʌ / in the International Phonetic Alphabet - occurs in the words month, money, love, and many other common words. It is an 'uh' sound, not an 'o'.

I've heard they have a slight sound different.... but i don't know and i can't recognize in sounds pronunciation.