Current Beeman model numbers for Spanish, Chinese, etc. guns have passed me way up! But, in the good old Beeman/Weihrauch days:
Rifles:
R1 = HW 80
R6 = new HW 50 (aka HW 99)
R7 = HW 30
R8 = old HW 50
R9 = HW 95
R10 = HW 85
R11 = HW 98
Pistols:
P1 = HW 45
P2 = HW 75
P3 = HW 40
Beeman sold the HW 35, HW 55, HW 77, HW 90, and HW 97 rifles, and HW 70 pistol, under their original names - also the HW 30 and old HW 50, in pre-"R" days. These guns are all springers except the P2 and P3 (single-stroke pneumatics), and HW 90 (gas-ram piston).
Most of the "R's" had replaceable-component differences from the German equivalents (new stock design, added safety, leather piston seal changed to plastic, mainspring and/or piston weight tweaked for more power, etc.), but the actions are otherwise the same.
Another worth mentioning is the Beeman P17 pistol, which is a licensed Chinese-manufactured copy of the P3/HW40.