New player questions

[TheJohan]

Hey, I'm new to the Munchkin games, and I have a few questions:
1) I bought the western version (the good the bad and the Munchkin) and the Shakespeare version, searching online I've seen them always separated in different sections. So my question is, are these versions compatible with each other? Can I mix the two? If so, are all of the Munchkin games compatible with each other? Or where is the limit
2) I bought the western version (the good the bad and the munchkin) in a local store here in Italy, later searching online I found the expansion (the good the bad and the ugly 2 "beating a dead horse"), so I asked if they had it in store, but apparently the pack I got is complete with both versions. Can anyone name some of the cards from the expansion so I can check if I got them in the OG game?

-TheJohan

[emigio]

2) in the italian version "il buono,il brutto il munchkin" there is also expansion 2. i don't even think that exists an italian version without expansion 2
here an example of cards from expansion 2:

Acquavite di Mele Applejack [BBM2]
Aiutante: Il Tuo Amico Defunto Sidekick: Your Dead Buddy [BBM2]
Anello del Desiderio (III) Wishing Ring (III) [BBM2]
Asso nella Manica Ace in the Hole [BBM2]
Avvelenamento da Piombo Lead Poisoning [BBM2]
Baro! (II) Cheat! (II) [BBM2]
Cactus Jack Cactus Jack [BBM2]
Caospolluzzo Whangdoodle [BBM2]
Cappello della Domenica Sunday Bonnet [BBM2]
Cavalleggero (I) Cavalry (I) [BBM2]
Cavalleggero (II) Cavalry (II) [BBM2]
Cavalleggero (III) Cavalry (III) [BBM2]
Cavalleggero (IV) Cavalry (IV) [BBM2]

[Brf]

The card list is here at the bottom of this page