I was not going to answer because it is not about lawn mowers but on the same line different names on machinery (shop brands) how much do you know about stationary engines??
Southern Cross made engines for Cooper, Invicta and SCIEL all very collectible and the different name does not decrease their value
Have you heard of R&T ?? they made a unreal number of engines under different names and the list just goes on and on like a USA Bull Dog left the USA as a Bull Dog arrived here as a Emu
Then if we go to cars like Mazda and Ford another big list of changed names
Have I got evidence of a mower no, but next time one shows on E-Bay/Gumtree up I will make sure you know
Ian