Is it possible to create two of a mob male and female per say, so I have two seperate mobs which are modelled and look male and female, but then in breeding can it be made they can only breed with each other or does the mob have to be the same?

It's "per se."

 

Well. You can use IExtendedProperties, or even make entities with NBT.

You can look at Minecraft's code of breeding (Child) for details of that.

 

Create new data and make sure that "between each is a male and a female" to allow breeding.

This would take quite some time to accomplish, but it's not impossible

I wrote my own breeding script for a raptor class.  It wasn't hard, took about 5 minutes. 

 

Look at the vanilla breeding script and adapt it.    Your biggest trick will be deciding how to trigger it.  On mine i made it to where they tried to breed after chowing down on a live animal instead of the right click event.

ok i'm not asking for it now as I'd rather try do it myself, but do you have it available that I can see if so required?

Sure,

just PM me if you need it.  It wasn't that hard to figure out from the vanilla breeding stuff though.  The Minecraft programmers should be shot for some of the ridiculously complicated ways they do things, but this one was fairly straight forward.