The Original Scent is what is on the market now as the plain bar soap scent. Back in the day when Irish Spring was fairly new, it smelled stronger and had a more masculine scent. They changed it to the current scent to make it more appealing to both genders. The Legendary Classic scent is supposed to be the earlier scent from the 1970s.
I can't describe the difference, but there is quite a bit of difference in the two. The Original Scent smells like the old Irish Spring soap bars that have been marketed for years. The Legendary Classic has a slightly different scent, but seems stronger and lasts longer.
One of the leprechauns doesnt have a 4 leaf clover cape? One makes u wrinkle even when your aroused? One smells like new spring and the other is swampy like old spice? Masage them in and let it marinate 3 hours, strange things will begin to grow and glow?
One smells like potayto and the other like potarto
My guess would be the labels and not much else.