I believe the ERacer used more plys in the spar layup and I've not heard of anyone doing this on the Long-EZ.
I've also heard others say that this was not advisable on either aircraft. Because making the spar stiffer/beefier only adds weight
and does not affect the overall strength of the completed wing.
Since there has NEVER been a spar failure on a Long/Vari/Cozy I doubt you could make a case it was needed.