Using your number requirements here are some calculations:

16T, helix angle 60 degrees, 24DP, OD 1.4167

32T, helix angle 30 degrees, 24DP, OD 1.5934 You see by having the different helix angles the OD's are close. Which you want.

16T, helix angle 60 degrees, 32DP, OD 1.0625

32T, helix angle 30 degrees, 32DP, OD 1.2172

45 degree helix angles are pretty much what commercial gears are made with so here's some numbers for this type.

16T, helix angle 45 degrees, 24DP, OD 1.0261

32T, helix angle 45 degrees, 24DP, OD 1.4767 When you use 2 gears with a 45 degree helix the larger gear gains almost .50 in diameter