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Look at the "K".

In the authetic signature, the "K" is made with an initial "checkmark" or "V" formed by a downstroke and a connected upward-swinging (and convex downward) diagonal stroke to the upper right, without the pen lifting. The pen lifts (after an apparent hook at the top of the upstroke) and then forms the second diagonal stroke toward the lower left. Then, without lifting, it forms the "i" and remining letters in a zig-zagging style.

In the suspect signature, the "K" is formed by a downstroke, with the pen lifting, and beginning the upper diagonal stroke FROM the upper right (after an initial loop above the stroke); the pen does not lift as it moves left of the vertical stroke, and loops back to form the lower diagonal, after which it lifts before beginning the tight, looping reminder of the name.

I am not a handwriting expert, but after studing and practicing the writing of Chinese characters, one becomes very sensitive to the direction and sequence of strokes.

Those were not signed by the same person.
My signature's smaller case hand writing may change, but the way I sign my capital letters does not change like that.

Others may scoff, but that 'minor' difference amounts to a drastic change in one's writing style.
I'm no hand writing expert either, but the above is what I've heard, been told, and read/personally experienced.
(I draw, changing one's handwriting style is a necessity while doing that for lettering purposes.)

My dad was a full-time admin tech for the Ark Nat. Guard. He signed his company commander's signature on documents on a day to day basis because the company commander position was not a full-time position and he was never there. My dad and a supply seargeant were the only ones in the office full time out of the whole company. Not strictly kosher, but thats how it worked in order to keep the company running.