Ranger: Wolf Form vs. Greater Wolf Form

[Scoojitsu]

Besides the run speed bonus, is there a difference between Wolf Form (lvl49) and Greater Wolf Form (lvl56)?
Both seem to add 40 ATK which is the relevant bonus when talking about rangers and melee.

People are advertising Lupine Dagger saying you can benefit from Greater Wolf Form at lvl 45 (proc) which you would only get at lvl 56 regularly.
To me it seems it's only a 4 lvl advantage as Wolf Form (lvl 49) does the same thing.

Thoughts?
Thank you