The first question is, is there a distance gap between the 6 and 5 irons? The reason for the mixed set is for when the next iron no longer gains 5 mph ball speed from the previous one. That shortens the distance gap and lowers the landing angle so the ball will run further than desired or expected.
If fitted and the T350 5 iron was recommended over the T200, adding the T200 (now T250) 5 iron may not cover your distance gap from the 6 iron and tend to not hold a green as well. If your current gap is more than 15 yards, you might want to adjust the T350 to 24 degrees. The purpose is not to align degrees but to gap distances and maintain descent angles.
That’s the empirical answer. Without any knowledge of your current ball speeds and distance gaps, any advice here is free and worth every penny.