I'm pretty sure the 415 and 425 are the same electrics-wise, though the 415 obviously sounds better as it has a matching headstock.😀
I have a BTB675 with the small-logo'd Barts in (which I think means they are made under licence) and the Bartolini pixie-wrangling gubbins as opposed to the Ibanez one. The Yam has fairly dark-sounding flats on, but still somehow manages to growl like a muthafunkster, whereas the BTB needs that extra bit of overdrive to get anywhere near, even with rounds on. I've been undecided as to whether it's the pickups or the EQ/pre that can be a bit clean. (not that it doesn't have its place)
Oh, and I pretty much never play without a BB-1X in there.