Unfortunately, I don't use Elements and don't even have a copy I can play with, but in any of the full versions of PS for at least the last 5 or more years, you would just type in the desired crop dimensions (ie, in pixels, inches, etc.) and the image would be cropped to exactly that size.
A slightly more difficult task is how to specify what area of the original you want to remain after cropping in each of the pix, e.g., the exact center of the image, the lower left hand corner of the crop is at the lower left hand corner of the original image, x inches from the left, etc. To do this in the full version of PS, I would use its "snap-to-guides" feature. I don't know if Elements has guides or.a similar "snap-to-guides" feature, but you should be able to look it up.
Sorry I couldn't be of more help.
Tom M