You're correct in thinking it's related, this one is a 7025-8099 which replaced the earlier 7005-8052. The 7005-8140 was based on the 8052 but as far as I know that reference is only found on the military marked examples. They were pseudo divers really only being water resistant to 70m and they're often called the poor mans 62mas due to the resemblance to Seiko's first proper diver.