I worked in Lowe's CS about a year ago. I'm trying to remember so I will explain as best as I can the difference in cards....
Regular store card.... seems to always have 0% for either 6 or 12 months. Sometimes it is just for flooring or just appliances. Sometimes (around holidays) it's usually for any entire purchase of $299 or more. (on same receipt)
I didn't do alot of apps for the project card. Honestly, the only thing I remember about it was that it was usually a higher CL. Say you make a purchase of $3000.... you have so many months to pay it back (in full). I don't recall whether the number of months had to do with the apr, but I think it did. Like the longer you choose to pay it off, the higher the apr. I think there was actually a minimum that you had to purchase, too.
crap, that's all I can remember. If you wanted more info on it and were really interested, I'd go to the CS desk and ask for a phone number for the card. (Because while working there the whole 5 years, I only say 2 of these "special" cards so I doubt CS could actually assist you further.)
It would also help, too, if you mentioned how much you planned on buying when talking with the card rep.
HTH...... I know, it's not much....sorry