SeeK19: Welcome to SOTW. Your question is not as simple as it seems, given that many of us here have strong opinions about whether or not body material, any finish, lacquer (or the absence thereof), plating, etc., or shape has any affect on sound. Personally, I don't buy it but others disagree.
Here's my experience . . . I own an S901, an S992 and an SC902 (straight brass, straight bronze, and curved bronze Yanagisawas) among seven sopranos. In over 50+ years of soprano as my main instrument, I have played a TON of various sopranos, straight, curved, tipped-bells and original King Saxellos.
They all sound like sopranos and in my opinion, more depends upon the player and his/her mouthpiece choice and tonal goals, than anything regarding the material, finish or shape.
Specifically, I've played other S901's and my own S901 alongside my S992 and I cannot hear a difference.
A while back, I owned an SC901 while I had the SC902. In that specific comparison (SC901 to SC902), I THOUGHT I heard a little warmer sound coming from the SC902. That's why I kept it. But frankly, the difference could have been caused by things other than the brass vs. bronze. The difference, if there was any, was well within the normal variations one hears when comparing two of ANY saxophones. To decide the difference was caused by the material would require me to play hundreds of them side-by-side (and probably blindfolded) to make an objective claim about it.
So, if you are contemplating a purchase, I'd save the extra cost and go for the S901, although the bronze horns are really gorgeous. Beware of marketing hype when assessing anything, especially saxophones and their accessories. DAVE