Or are synths just really linkin parky?

as far as i know, yeah

"somewhere i belong" i think it is

either that or linkin park sampled from luke chable... i dunno which came first

I don't think it's an actual sampling in this case. I think both parts are uniquely played, but they do use the same notes. I think Chable "ripped off" Linkin Park on this one, if you can call a 16 note sequence comprised of 3 or 4 pitches 'ripping off'.