Capital Component BPO Seeding?

My question is the following; I was wondering where these are are actually seeded?
Now I have found seed-offers even in Jita itself but all of them had weird pricing differences which made me think that these might actually vary region/sec-status wise. Is that a thing? Or are the different prices between a “capital construction parts BPO” and a "capital jump bridge array BPO actually just weird leftovers from bygone times?
The component BPC are seeded all over the place.
the new components as well.

Damn didn’t think about checking evetycoon thx for the quick reply!