Hey everyone, I figured out the solution! Turns out ShiShi Sprite Manager does actually display the "assembled" Frames & Animations at the original scale, and screenshots/snips will match-up 100% with online sprite sheets.
The problem was that both my desktop (1440p) and laptop (1080p) were set to 125% display scale which was distorting my previous screenshot attempts. I realized this when I actually measured the height of a snipped idle pose frame at 45 pixels, which is 125% of 36 pixels. So if you want to "export" any individual sprite frames from ShiShi, make sure your PC display scale is set to 100%. I believe it is also possible in Windows to set the Display scales of individual programs...
The problem was that both my desktop (1440p) and laptop (1080p) were set to 125% display scale which was distorting my previous screenshot attempts. I realized this when I actually measured the height of a snipped idle pose frame at 45 pixels, which is 125% of 36 pixels. So if you want to "export" any individual sprite frames from ShiShi, make sure your PC display scale is set to 100%. I believe it is also possible in Windows to set the Display scales of individual programs...