They don't really provide the same skill set, as shown for the national team where Enzo was generally more involved on the ball, stood out more, and was the player that turned the team's performances around
Now as for the transfer fees, yeah, the difference is pretty mad, but it's the market
Absoultely, putting too much talk on prices is silly, it's just the market.
Yet..
Mac Allister stood up more in the NT and was more vital for the team since he is a more mature player with an extra ice "cold"/feisty winner edge that is great to have. Still you need to understand that like Modric, Gundogan and others in that mold, they do not have much pace, so you have to understand as a coach were you threw him to take advantage of his best attributes. He just turned 25 and is a very very mature player on every sense.
Enzo provided the spark of a very confident young player after two excellent breakout seasons with a jack for all trades atributes and great stamina, yet not mature at all and still don't having a more clear role combine with inmature tendencies due to his age.
He still operates too much on instinct and his technique.
Enzo needs to find his real role or at least do many roles but more calm, with more tactical awarness and less tendency for the fancy stuff just to be fancy.
Still he is very committ, he is not shy, he ain't a wuss and he might prevailed or sadly get crushed under the weight of those trillions they paid for him in a very disfunctional CLUB, not just team at this moment.
Timing is everything, I believe if Man Utd bought him, him with the initial Casemiro and a healthy Lisandro at the back would have provided a very much needed hold on the ball for United, but we all know how life operates and how things are now with him, Case and Licha.
He should have stayed in Benfica, being loved instantly, playing in great form, growing into a role and alter make the jump if he wanted to another League or club, more mature, in a more organized context.
I dunno if it was his agent, if it was him, or the Club smelling all those zillions or all of those things at the same time, but it looked like a bad move and it ended as a bad move. Now he has to grow a thick skin, try to mature a lot faster, embrace those gallons he looks wanting to grab at Chelsea and play in consequence at the best he can.
BTW perceptions are everything, nowadays it looks like Palmer does everything right, while he doesn't, everyone that watched the kid in City and nowadays, nows that he has talent, he has balls, but like Enzo he is fecking inmature as hell.
He constantly keeps the ball without passing, he gets into crowded areas loosing it, he realeses too many times when the advantage is gone after his initial great play....like Enzo he has to mature, but it's very improtant to show like he does, desire, will, courage to be him (like Garnacho, Mainoo so far) and NUMBERS.
The thing it's that as long as he scores or assists, all these things that any Chelsea fan can see, will be forgiven and more when his price tag wasn't that high and being "snatched" from City.
Back on Enzo if he doesn't translate in stats his game more often, even if he ain't a true super skill 10 or sthg like that, he'll face more and more backlash. No matter if he actually does a good or very good game, he is in the spot since first minute and HE PUT himself there when accepting such a transfer, so he'll have to deal with it.