Kickstarter backers will get a longsword. Website purchasers an arming sword. The blades should be similar (a minor difference in length of 1-2" is typical), but the hilt is normally around half to 2/3rd the length, suitable for single handed use - though is it just barely possible to palm the pommel, this isn’t likely to be effective and using a one handed grip for increased reach is preferable.
Longsword is faster in the point, less tiring to use and hits harder, but arming sword can have a greater reach when using the normal grip (even with a shorter blade, because you can fight more to the side), and can be used with shield or buckler.
Not sure what the specifics of the WH items will be, but this is a general guide to historical usage.