Yes and no. Taft (which owned KECO) was only a minority stakeholder in Wonderland.
Other owners at construction included James Hardie, Leighton Holdings and the NSW State Superannuation Board...
Paramount purchased Taft \ KECO in 1992, but chose not to acquire the Taft\KECO stake in Wonderland as part of the deal. I think the logic behind it was the distance (as all the other KECO parks were in North America).
Sunway didn't acquire Wonderland until 1997 - in the interim, the Taft\KECO share was purchased by a local group of investors - the identity of which I don't know, but I'm fairly certain they were other than the original investment group.
I wish we did though - considering out of the 4 non-opening day attractions, both Demon and Probe were installed at a time when it was all locally owned. Only the Moore Park SkyRider was installed post-sunway, (and Zodiac while it was still KECO).
That said, Probe was an expensive investment at the time, and possibly led to some cash flow issues leading to the sale to sunway - purely speculation, but it makes sense within a year after the ride opened.