Please forgive this newbie question 
I'm demoing two 2022 DGT SE's in Tobacco Sunburst, and one of them sound brighter/tighter, which I like.
One of them weighs 6 lbs 14 oz (it's the brighter one), and the other one weighs 7 lbs 11 oz.
I do know enough to know that it's the totality of the guitar (things like wood density, differences in the wiring components, pickup height {both the same), etc.) that contributes to the sound of a guitar, but I have found out that the brighter sounding one has new D'Addario NYXL 9's on it (that's what I was told, but they feel/look like 10's), and the heavier one has the original PRS strings on it.
So here'a the dumb question....................................................................................
In this case, is the "most likely" culprit in the difference in sound due to the strings?

I'm demoing two 2022 DGT SE's in Tobacco Sunburst, and one of them sound brighter/tighter, which I like.
One of them weighs 6 lbs 14 oz (it's the brighter one), and the other one weighs 7 lbs 11 oz.
I do know enough to know that it's the totality of the guitar (things like wood density, differences in the wiring components, pickup height {both the same), etc.) that contributes to the sound of a guitar, but I have found out that the brighter sounding one has new D'Addario NYXL 9's on it (that's what I was told, but they feel/look like 10's), and the heavier one has the original PRS strings on it.
So here'a the dumb question....................................................................................
In this case, is the "most likely" culprit in the difference in sound due to the strings?