Well, it would seem odd to start with the 134x movement family unless you wanted one of its key features, central pinion-mounted chrono seconds and minutes, exactly as per the 5100.
I have to say I know nothing about Ebel, but it seems very unlikely that this is the case.

However, it is Breguet that has ended up with the Nouvelle Lemania Company (in 1992).

You can understand that with a haut horology reputation like Breguet, incorporating the 5100 into their range would look terrible - It has plastic parts - the horror.

However, almost equal function was available in an all-metal movement, the 134x series

Their Type 21 does have central pinion chrono-minutes and seconds, and I have read that this is a development of the 134x, but being an idiot, I did not save the link and searching for it now has proved entirely fruitless.

Sorry not to be more helpful, I would appreciate any more knowledge, as the 134x series fascinates me, mostly for its very short-lived career.

Cheers
DaveS