If you were buying Pentiums throughout the day, you would know off by heart all the numbers and versions.
I would say that the majority of people [on this forum] take a look at processors when they are buing a new computer or processor. Any other time they will not be bothered whether is a J variant etc, etc,.
A little bit of product research will have you clued up in no time.
google and intels site will reveal all.
A click here, a click there.
You also have the option of asking a "Sales Person" who might know ;-)