@Warhawk77:
Starting to play more and I was wondering do all the box sets have the game pieces in the same scale?
The short answer is “mostly yes”. The longer answer is a bit more complicated. From game to game, A&A sculpts have generally been on the same scale when you compare units belonging to the same unit class; in other words, specific sculpt X will generally be the same size no matter which game it comes from. Within each class, however, scales can vary; for instance, the Yamato and Iowa battleship sculpts are roughly the same size, even though in reality Yamato was much bigger than Iowa. There’s even more variation between unit classes, the most extreme case being the scale of the infantry sculpts and the scale of the battleship / carrier sculpts.
There have also been some cases of scale changes for specific units. The British and German battleship sculpts became larger and more detailed when many of the sculpts were “refreshed” at one point. The German 88mm sculpt went from being small (and mis-representing field artillery) to being large (and correctly representing an AAA gun), and the same thing happened to the Stuka (which originally mis-represented a fighter rather than a dive bomber). And note that the ANZAC infantry sculpt is somewhat notorious for being rather large compared with other infantry units.