AFI 13-219 is the governing document for CCT Evaluations, AFI 36-2204 governs PJ. SOWT is following 13-219, last I heard. You can google the AFIs.
AFI 13-219 and 36-2204 allow the snorkel and
freestyle. That doesn't mean you get to use them in the Pipeline, though, as the AFIs only apply to qualified Operators. The Career Field Education and Training Plan (CFETP) governs Trainees.
I haven't read the CFETP for any of the careerfields lately to see what the PT standard is. I believe CCT and PJ Trainees can use the snorkel and
freestyle stroke AFTER graduating SCUBA school but not before. That would be at Kirtland for PJs and after Phase I (Pre-SCUBA) at STTS in Hurlburt.