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?

https://evetycoon.com/market/21010
The component BPC are seeded all over the place.
https://evetycoon.com/market/57512
the new components as well.

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