I don't have pics of the original TGITG minis, but I made a couple size comparison pics of their not-Sororitas line. (Note that some of the Sisters of Eternal Mercy product line was scaled up a bit and re-issued. The minis I have are from the original release, before re-scaling.) The gal 2nd from left in the first pic, with the pointy helmet and ballet pose, is closest in size to the original TGITG lines (Kurganovas, Jailbirds, etc).
A friend of mine has a bunch of the Jailbirds line. Generally they're a bit shorter than old Cadian guardsmen minis, but the biggest difference is how much more slender they are. Both bodies and equipment are slimmer, less boxy than
GW minis. They don't look like they're out of scale (
IMO), but standing next to
IG or
SM they have a very different aesthetic.