Try copying them and keeping one copy safe -on a thumb drive.
Open the new copy in paint and crop the fields as close to similar as possible (use stars as a guide) -save as another name in a new folder,ie 'flick'.
Open the new folder, right click on one of the images and open with 'Windows Photo Viewer'.
Click the next picture button repeatedly and the image should flick between the two images (if they are the only ones in the folder). Practice the croping to line up the stars.
Keep you originals safely away though.
More ideas if you can save them as .tiff or .fit
Good Luck
