Ayuh. In this case the simple math (adjacent strings in 4:3 ratio -> same tension when tuned a perfect 4th apart), pretty much surefire with plain strings, is confirmed by tension data of wound strings, a sign that there's no skip in the proportion of one or the other layer in the innards of the respective strings.Thanks for the info. Very even pull on the strings!
However, to be fair, the usual #640 Pyramid Gold set for Beetle basses doesn't have a .075" but a .07". So it's either a typo by the String Guy (or Pyramid), or one should expect a li'l bit less pull from the A string. Probably not an uber-significant difference.