Very little is specified, but "modular factories" (Presumably made OF the old factories) were brought to the Empire, and the manufacturing for the Warwolf, Wulfen, Black Wolf and Tomahawk II are all listed as having been reestablished in the Empire. As such, I would be inclined to assume that those lines were moved in their entirety. So, no free access to all the new wolf toys for CHH, I would infer from that.
Older designs are where it gets more ambiguous. We can only guess, but given the commonality of parts between the Warwolf and the Timber Wolf, and the fact they were building them by hand, I would guess that the wolves have probably retained the ability to build them, though I'm sure someone could put forward arguments for their not having bothered. Personally, I'm going with "build them alongside Warwolves in the empire"
Blood Reaper? Lobo? Sun Cobra? Don't really have anything to go on with these.
Gargoyle? Well, no real indication that they ever reestablished production of these (seemed like they'd lost it as of Objectives Clans) BUT, if i were to grasp at straws, 3145 NTNU provided a Gargoyle config that looked to me like something CHH would use. It'd be perfect if the wolves had been building the gargoyle and the horses assumed control of that line, OR if they reestablished it on the foundations that the wolves left behind.
Tundra Wolf? Ambiguous. They DID give it a NTNU config (5) but its fluffed as a design to make up for shortfalls in Tomahawk II Production. a horse apiece, on this one.
What we know for certain is that they left SOME infrastructure behind. it didn't sound like they were abandoning entire mech lines, but they definitely couldn't take anything. We'll probably never have a full picture of what was taken and what was left, though.