Both should do the job for you. The 2.4" Sharps & the .45-90 WCF share the same case dimensions. The Sharps was loaded with heavier bullets [edit] so a correspondingly longer OAL (Winnies sported a 300 grain, although I usually load mine with 405 g).
You can use a .45-70 die to seat & crimp/partial size as well, if you're stuck.
I have a set of CH4-D .45-90 dies, just another option to look at. They ship direct to Canada.