There's nothing in between, they were recorded simultaneously. Meant to be released as a double album.
90s Metallica is excellent.
Not too sure about that one, from the songs I've heard I doubt it'll be able to match MOP, but maybe it'll be around the level of RTL. Maybe it'll actually be pretty great. Who knows? Either way, I'm going into it with an open mind.I'm sure you'll love ...And Justice For All as well.