How to identify 2 bmp images?

i am creating a program that u browse for 2 bmp image and identify each one by sending a massage box tell the user which is the picture was browsed . At all the time i have 2 pics .The problem is that the 2 images has simmiler properties as u see it in the pic. I be happy if some one help me with this .Thanks

http://i5.photobucket.com/albums/y180/method007/454.jpg

http://i5.photobucket.com/albums/y180/method007/453.jpg

http://i5.photobucket.com/albums/y18...007/pixcel.jpg