hi
been racing for twenty odd years now you cant mix'match teeth pitch
IIRC .6 and .8 modulus are metric and 32,48 and 64 DP are old school imperial spec. DP i think refers to diameter pitch
tamiyas tend to be metric .6 also kyosho IIRC schumacher and the like are either 48 or 64 (finer pitch)
.6 is close to 48 dp but eventually eats either pinion or spur
dont take it as gospel i have known to be completly wrong
dave