Hmm do you have a direct comparison?
While probably different proportions of length, height, and width, they look the right size (most likely not as wide/tall but longer than
40k). Unfortunately me scouring the web does not have a direct comparison so I'll have to photo jump
Heres the
DT Heavy tanks all next to each other
Here is the middle tank next to
DT infantry (who are a hair taller than
gw figs)
SSU Tanks vs their 1/48 ww2 cousins
http://www.lead-adventure.de/index.php?topic=48753.0
40k Russ vs a 1/48 KV2 with a bigger barrel