Bachmann tank cars

[frogacres]

I have noticed two different series catalogue numbers for the Bachmann tank cars ie 881xx and 884xx.
Are both of these 1:20.3 scale?

Trevor James
Downunder

[Matthew (OV)]

Of those, the first one (881x) has a frame, the (884x) are the frameless; both are 1:20.3 SPECTRUM quality cars.  The older 1:22.5 big hauler tank is a 9xxxx number.

Matthew (OV)