#2
They are different. Just look at the ESP/LTD website and they can tell you under the description of the guitar. Or you can see them on any guitar website that sells the guitar under "specs". I have a sig model and it came with 9's

ESP LTD RZK-600
4 Custom Strats
1 Custom Soloist (Warmoth)
1 Custom Telecaster (Warmoth)
2007 Jimmie Vaughan Sig Strat

Callaham Hardware & Bridges
Fender Custom Shop 69's
Dimarzio Breed Pickups

Blues Junior Amp
BlackStar HT Club 40 Amp
#3
Well scratch that. I just looked to see for myself and no one is listing the string size anymore. Most of the ones I have seen or tried out had either 9's or 10's.
http://www.musiciansfriend.com
If you go to this site and pull up the guitar in question then on the right side of the screen will be a "don't forget these" section. They will list a pack of strings for the guitar. I pulled up several this way and all of them showed 10's.

ESP LTD RZK-600
4 Custom Strats
1 Custom Soloist (Warmoth)
1 Custom Telecaster (Warmoth)
2007 Jimmie Vaughan Sig Strat

Callaham Hardware & Bridges
Fender Custom Shop 69's
Dimarzio Breed Pickups

Blues Junior Amp
BlackStar HT Club 40 Amp