x-five xfive xseries p226

Is there a fundamental difference between the P226 X-Five models and the XSeries XFive (note no hyphen) models? There are some with very similar names but different features. For example: P226 X-Five Tactical (P226 X-Five Tactical) at $1696 vs XFive Tactical (XFIVE TACTICAL) at $1678 and...