Makita Drill numbering system

I am looking to upgrade my hammer driver drill, so I have been doing a bit of searching around. I have been wondering if there is any way to understand the Makita blue numbering systems for their drills. They've got DHP481 and BHP481 to DDF... to DTM... etc etc etc.



I can't fathom if these numbers so I can't tell what the difference are between the different types.



Anyone got any suggestions?



Cheers!