The are several differences between the original acrylic eye PC minis and the Mattel minis.
The hair color is similar, but the Mattel version has fuller, bigger hair. Facial features are more distinct on the older PC dolls.
You can see the Mattel hands are not as defined as the PC doll who has nails and finger ridges.
There is a slight height difference.
The difference in the color of the dresses are different, the aprons and shoes are the only items that match.
The preferences are up to the individual collector.