There are three versions of AC:
There are no technical differences between the three versions, so everything that works on the Standard is compatible with the Pro; the physics are the same; I think the Pro comes with the data.acd already unpacked, but a part from that there are no differences.
- Standard (?), the one everyone can buy on Steam;
- Commercial, which can be used for commercial uses, but mods/track skins are prohibited;
- Pro, which is the same as the Commercial, but car/track customization is allowed (Ferrari race cars are not included and cannot be used).
There are no technical differences between the three versions, so everything that works on the Standard is compatible with the Pro; the physics are the same; I think the Pro comes with the data.acd already unpacked, but a part from that there are no differences.