Upgrading to 15' wheel vintiques series 63

With a 15x7 in the back I would use the 4” backspace.

A 15x8 with 4.5” of backspace and a 15x7 with 4” of backspace have the same offset- the centerline of the wheel is in the same place.
Ok, awesome.

So if I got 15x7 4” BS in the back and 15x6 with 4” BS up front I should be ok?