I’ve had the N200 for a while and am very happy with it using Silver Sonic Mirage USB to a Denafrips Pontus ll. Seeing that the N150 came out after the N200, I’m not sure you are going to get an answer to your question.
My 2 Cents. With the N150 being newer, I’d bet it sounds different. Some say better, some say worse, but will it be an improvement? Probably too close to be worth it.
All the best.

