GMT vs EXP

[TerryF]

Quick question for you guys n gals...

I've been looking around extensively at all the GMT threads, the differences between the various dials, inserts, bracelets etc

This then leads to looking at the difference between the Master and the Master II and the differences between them, timelines, colour inserts available and from when, bracelet compatibility etc.

Then I had a look at an EXPII, which I am seriously lusting after, and wondered what the difference was between the EXPII and the Master's. They look identical if you ignore the white vs black dial and metal colored bezel insert. It has the 24hr hand just as the Master does.

So whats the difference between the two?? And if its the same, practically, what was the purpose of bringing out an almost identical watch to the GMT Master??

Could the crystal, bezel, bezel inserts etc be interchangeable??

Appreciate your responses as always.

Ps. EXPII pic credit to Brit78 - hope you dont mind :)
Pepsi is mine.