That would be nothing different from Hewitt doing good vs Federer in the teen years or in early 20s until Fed reversed everything at age 22.
You can expect something similar even if they were aged same and I assume Murray having some initial edge (unlikely but for assumptions sake
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Thats why it is not surprising than Hewitt and Murray have same similar career stats, they are actually same level players born 7 years apart, old wine in a new bottle.
Hewitt has 2 slams, 80 weeks at 1, two YEC Tittles and has lost 13 times in slams to the eventual champion.
Murray has 3 slams, 41 weeks at 1, one YEC title and has lost 13 times in slams to the eventual champion.
Similar players with similar talents, anyone glorifying Murray to be a 6-8 slams winner in other eras is delusional.