you said 6.3.2 is 6.3.0 SP3 plus a few other goodies : it means that program developped under 6.3.2 and build is fully compatible under 6.3.0 SP3 (without using goodies, elaborated functions …) ?
Now most programs developed under 6.3.2 will be fully compatitible with 6.3.0 SP3 but some won’t.
It all depends on exactly what your program is doing and more importantly what libraries/system calls it links against. I think (someone may correct me) that if you link statically you’ll be fine (assuming the call exists in 6.3.2 and 6.3.0 SP3). It’s dynamic linking where you’ll run into problems.