Normally the Vox drums would have had foil stickers and the T-Rods would have had squarish handles , that said Vox on them. Those are pretty much the only difference between Vox and Trixon.
The reason the two existed, parallel in the market was that St. Louis Music had the distribution rights for Trixon and then Trixon became financially involved with an Irish piano company that was under the umbrella of The Thomas Organ Co. , which distributed VOX in N.A.-----so, Thomas twisted Trixon's arm into letting them distribute Trixon drums under the VOX brand . That might seem counterproductive but it wasn't really because the two brands probably were sold in different music stores, mostly.
The same thing occured with Premier and Beverley-----Beverley dealers, not being Premier dealers, so it actually added to Premier's sales, especially when they handed it over to B&H.
The Blue Croco wrap is only repairable by straightening out the tears ,if you can and regluing them. It is a lot easier on that wrap than others, because the foil part is quite thin and pliable. The actual wrap pattern is on a very dense , almost untearable, sort of composite backing, kind of like oilcloth , into which the pattern is pressed.There is a thin plastic layer over that , then the coloured foil. Theoretically, one could rewrap a Trixon Croco set , with anything that would take an impression of the Croco pattern-----obviously, foil is perfect.
Blue Croco is one of the more collectible Trixon wraps. It also appeared as Silver, Gold and Red. I think blue was the biggest seller. Sometime after Trixon ceased production, Tromsa produced Croco wrapped drums, also exporting them to North America under the Roxy badge. Apparently there was also green, on those drums------never seen it but I've seen Roxy blue and and Tromsa red.