the celtic is old mahogany, the rangers is sapelle. and the rangers has a chunkier neck Other than that they are identical construction
wiring is Blackdog pickups with a c--ked wah push/pull and series/split/parallel on the 3-way switch
there is a slight tonal difference, the celtic has a little more meat to it but the rangers has a little better single coil tone... but they can be made identical with a little eq tweak