If you are "average consumer" , you should buy via budget mostly , if you want to read specs , then you should understand what you are reading , If you are a consumer that just walks into a store to buy a computer with no prior knowledge on what you are getting (i.e basic market research on what you are going to guy) , then it doesn't really matter.
They have different CPU`s and GPU`s , if you don't understand that when buying a computer not sure anything Apple does will help that consumer picking a computer , as they will probably by via budget.
We call them 4 ports / 2 ports to easily distinguish between them , not sure you need a new SKU name for the 2 port machine (assuming they want to keep selling this machine).