We have the older 'Advanced Rules Set' option which includes the high speed tool options
Apparently, there is no way to designate a set of nets into a class and then have them all DRC checked to be within a certain length overall or to each other.
Is this correct?
Here is the help file note on the 'matching option' of the high speed tools, note that it seems to be just for autorouting and there is no way to DRC check it.
Some routers can automatically route traces with matched lengths. For
example, traces for differential pairs have matched lengths in order to
avoid signal timing skew between the signals.
- Match lengths check box—Specifies to automatically route traces with matched lengths.
the maximum permissible difference between the shortest and longest
lengths between traces in the matched-length group.
Restriction: PADS Layout does not check length-matching rules.