Alves was just the first name that came to mind, I didn't look up the age at the time. So sure, you probably won't find many players that had the exact same age and same scoring record, in that regard Haaland stands out. There have been young players who where hyped at an even younger age though who might not have had the same scoring record but had other stand-out traits to their game to get people hyped such as Bojan Krkic, Breel Embolo or Obafemi Martins who all went on to have very sub-par careers.
The point is, while there might not be a 100% acurate precedent, remarkable performances of young players in the CL or players scoring for fun in a single season have been there in the past - but when those performances have occurred over a rather short period of time it will always be a considerable risk for buying clubs as there's simply no supplement for proven consistency over several seasons. Haaland stands out, but despite his great scoring record he will probably still be seen as a riskier buy for big clubs than, say, Timo Werner.
