What is the difference in width between a SN95 axle and a New Edge axle?

Turns out it's about 40mm or 1.5 inches total - or half that per side however you want to think about it.

A New Edge axle is approximately 62-1/4" wide and a SN95 axle is approximately 60-3/4" wide.

You should be aware that the lower control arm bolts for SN95 and New Edge axles are slightly different in size but you can just swap control arms at the same time, or buy aftermarket control arms which match the axle and it fits perfectly.