Reks/silver-haired boy: one and the same?

Just wondering if anyone can confirm... or deny if Reks and the silver-haired boy that Ashe "marries" are one and the same, or two completely different people? Because on the one hand... it would make sense if they were the same, because I'm assuming they "married" at the beginning of the game, and we know Reks dies and two years later Ashe seems to be travelling/fighting alone... so what happened to her husband?

On the other hand, if Vaan's brother was marrying Ashe, wouldn't Vaan know her pretty well already?

Also, if you look at these pictures attached their hairstyles seem to differ quite a bit:

silver1.jpg (19.8 KB) >> the "silver-haired boy"
silver2.jpg (17.8 KB) >> the "silver-haired boy"
reks1.jpg (17.1 KB) >> Van's brother "Reks"
reks2.jpg (15.4 KB) >> Van's brother "Reks"
ashekiss.jpg (45.3 KB) >> Ashe and WHICH?

I know I'm looking too much into this, but it was just such a jaw-dropping trailer!