I'm sorry, but what in the actual feck is this?
Not only is it inaccurate/false/wrong, it's probably the worst example of cherry picking (not even sure I'd call it that) I've ever seen.
But since stats is seemingly your thing, lets do a much easier comparison. Let's compare their age 19 season (20/21 for Mason, 19/20 for Erling, you know, since they're only 15 months apart age wise, not three years). League and CL/EL.
"If both were same age" – well, here are the actual stats when they were same age.
Mason
League: 31 games / 1825 minutes. 7 goals, 2 assists. Point every 202 minutes.
CL/EL: 14 games / 919 minutes. 2 goals, 2 assists. Point every 230 minutes.
Erling
League: 29 games / 2042 minutes. 29 goals, 9 assists. Point every 54 minutes.
CL: 8 games / 554 minutes. 10 goals, 1 assist. Point every 50 minutes.
I'm not saying this is conclusive evidence of anything at all. But it paints a very different picture to whatever you were trying to prove in your post.