Why would you want to ignore the series numbers? They are correct as I posted them. If you pick up a #3 and it says 35 to 54 teeth you have a pressure angle, usually 14.5,* (English) cutter. If you pick up a #3 cutter and it says 17 to 20 teeth you have a module (metric) cutter. They numbered them that way so you would not make the mistake.
Diametral pitch, is the number of teeth divided by the pitch diameter. It changes from gear size to gear size. A guess on my part would say yes you can, but I would rather use the numbering system. Just my opinion.
There are only two commonly used pressure angles, one is 14.5* the other is 20* with 14.5* being the most common.
"Billy G"