the HD set has a .013 e, .017 B & .025 G, compared to the .012, .016 & .024 on the light set -
also, phosphor bronze strings from the same maker/series tend to have slightly higher tension than 80/20s
that being said, i was able to play a guitar that went back to the factory to have a warranty concern
corrected & when it came back, it had PB elixirs (mediums) & a micarta wave compensated saddle -
there seems to be more height on the hi e end of the saddle & the guitar sounded much deeper &
richer than when i heard it last (sitka/koa GS), when it had 80/20s & Tusq, & it plays easier as well
action at the nut is something else to consider, as it may be a bit higher than an older guitar that has a few miles on it