>>23400249
Not necessarily. It fulfills the same function, but it doesn't mean it can do exactly 1:1 same things. For example I don't believe you can slap the Primrose side binders onto it and mount a missile pod, winch cannon or thrusters onto that. Of course it has the new and refined wing binders shared with TR-S design, but due to the structure these are purged when launching the Primrose II. I imagine it could retain them if it stays in the compact form but that's not going to be flying by itself, it's typically used as part of Hrududu II.
After looking around a bit I wonder if it's a situation like S Gundam's G-Core. S has four reactors - two in the legs and two in the shoulders, meaning none of them are in the Core Fighter proper. And yet it has its own independent engine blocks. And what's more, although on its own it's focused on only its own survivability rather than combat use it can be combined with S Gundam standardized parts like boosters and weapons for independent fighting. Not unlike Primroses.
So now my best guess is Primrose II has an electricity source for its independent propulsion but it's not a full-blown reactor similar to G-Core. This way Primrose II can do what it needs to do and Woundwort's power output is still generated from the three units as stated.