Actually in his last season with us Higuain was earning more than Vlahovic is earning now (adjusted to inflation).
Here are the sources:
https://www.capology.com/player/gonzalo-higuain-32121/
https://www.capology.com/player/dusan-vlahovic-36553/
In his 3 years with us Higuain costed the club roughly 58 mil Euro (adjusted to inflation)
In his 4 year stint with us Vlahovic will cost us around 59 mil Euro (adjusted to inflation)
So in reality Higuain actually was paid more on average per season. His transfer fee was also higher and we got jack shit at the end. At least for Vlaho we'll recoup a couple of mil when we sell him.
Stat wise they are pretty much the same per match or per min played. So I stand by what I've said earlier:
In terms of value for money Vlahovic > Higuain
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That's an absurd comparison. You can't compare Del Piero with strikers from the modern era because his importance to the club far exceeded his sporting value.
Higuain and Vlahovic only bring sporting value. Therefore you can compare the two from a bang for buck perspective.