What differences do you see? I don't see any and both look just like my #25. Maybe the manuals you are seeing are for the later models? I don't have the paper work here for my #25 and I can't remember if it covered #28, but the manual for my 460 covers quite a few different models ,the only difference being the travels. Obviously the bases are different to accomodate the longer travel along with the hyd cyls.