Since the comparison is coming up a lot, per 90 stats over the last 5 seasons, I've highlighted the ones where the difference seems important:
| Pogba (usually a CM) | Eriksen (usually an AM) | Eriksen this season (as CM) |
Passes attempted/Pass % | 67/82.5 | 66/77 | 62/78 |
Pass% short/medium/long | 90/85/71 | 88/80/54 | 88/82/49 |
Tackles attempted/successful | 1.4/1 | 1.25/0.77 | 0.66/0.57 |
Interceptions/Clearances | 0.9/1.2 | 0.7/0.7 | 0.3/1 |
Dribbles attempted/success/% | 3.3/2.3/70% | 1.1/0.7/54% | 0.6/0.2/33% |
Total touches/Dispossessed | 79/2.2 | 75/1.3 | 68/1 |
Fouls/Fouled | 2.2/2 | 0.5/0.5 | 0.4/0.2 |
SCA/GCA | 4.31/0.61 | 4.55/0.43 | 3.2/0.4 |
G+A (no penalties) | 0.45 | 0.57 | 0.28 |
Pogba has more accurate passing driven by much better long passing, better defensive stats, much better dribbling stats, but gets dispossessed a lot more. He has more goal creating actions, though Eriksen is more productive (don't ask me how that works).
The defensive numbers could be explained by position - Eriksen as the 10, Pogba as the CM/DM. But the same trend (even more pronounced) is seen this season, where Eriksen has played deeper.
So I guess a hypothetical fit Pogba would be have been a better defender, a better passer and much better dribbler, but more of a liability in possession and general misfit because of how much he likes to dribble and hold the ball. Pretty much matches what an eye test and their reputations would suggest.