Did they say how they analyzed the models? Because looking at the silhouette and other similarities isn’t enough to prove plagiarism when it comes to 3d models.
What you have to do is open up both the original and the suspected copy models and select a couple of similar vertices (the points that give the model geometry) and compare the position down to the decimal place. If they are even a little off, then it isn’t a copy.
Doesn’t matter how similar it looks though.
The only way to tell is to open up both models and look at individual points of the 3d mesh. If their positions in 3d space match up to, say the hundred-thousandth of a decimal, then it is a copy.
But if the model was scaled or rotated or whatever, there would be no way to prove a case because there wouldn’t be a match.
The same thing was done to prove games was lying about copying models from previous games when they claimed that it was too difficult to add all previous monsters into different games because their converter tool was giving them issues.