Your question is quite interesting. Metallic alloys with identical chemistry have different behaviors depending on the manufacturing process. Casting, rolling, heat treatment,etc. can alter the properties of the metallic materials. For example, two steels can have the same amount of carbon but in one case the carbon can be present as graphite. The heat treatments also alter the micro structural properties of metals, these micro structures are important for macro properties such as hardness and other mechanical characteristics.
I think that the best source of information are the ASM Handbooks on metals, if you have access to a collection at your job or in a public library you'll find plenty of information about the specific steels you mention in your post. Once I found a nice book at a friend's library that had hundreds of entries about steel, I think the title was something like "The little black book on steel alloys"
