I have RB2 in the box with the Sierra patch to RB3d on my HD.  I have not tried to install it yet.
Will this work as well as the "full Sierra RB3 box version" you mention?
I hate to spend days figuring this stuff out after dropping a bunch on a new PC.
  
Sure would be nice if some of the "classic" games were updated for XP and new graphics HW.
BTW I did get GPL running and it looks about the same as it did on a  450mHz Voodoo2 AGP machine.  Better frame rate and it runs smoother.  Still not eye-candy.
  
But you gotta see WWII Fighters on a new machine.  It is spectacular.  It's a great sim too.  They got that one right from day one.
I installed it yesterday on a 3GP4 800mHz FSB with a Radeon 9800 Pro card.  It is awesome.
 
Racer78