Hard to give a comparison really.
www.promods.net is the first one I'd start with. All the info you need is there, download at the top.
Fully modded it can be gigantic.
With Promods (Europe), EAA (Brazil), Italy, Republic of China, Australia/Tasmania, Rusmap, Southern Region it's quite large. I had that combination before on an older patch.
The scale is 1:19 but I forget how it's measured.