The second design for anything is usually an improvement from the 1st design, I'll go out on a limb here and say YES...the 2nd design is better, especially if it involved changing the races in the bearing.
If you're going to have one old and one new wheel hub on the car, that'* not an issue. If one is the 1st or 2nd design...that should also not be an issue. However; as I stated earlier...I woud recommend you replace then both at the same time.
Also, please add your year and trim of your vehicle to your signature line. That way when you start asking questions in other areas of the forum, we all have a better idea on how to assist you. Click on "Quick Links" above, go down to "User Control Panel" and then click on "Edit your Signature" It'* pretty straight forward from there.