Both of these are HKS A-Series speedloaders priced the same at $30.99, built for revolvers chambered in .357 Magnum or .38 Special and holding 6 rounds. The main difference comes down to which guns they are made to fit and the ammunition type listed for each.
The 10A is listed for a wider range of gun makes including Smith & Wesson, Taurus, Rossi, Dan Wesson, and Charter Arms, and is made of plastic with a Centerfire ammunition type. The PYA is made specifically for the Colt Python, uses a Polymer material, and is listed with a Rimmed ammunition type.
Spec for spec
SpecHKS Speed Loader 10AHKS Speedloader PYA
MaterialPlasticPolymer
For Gun MakeSmith & Wesson, Taurus, Rossi, Dan Wesson, Charter ArmsColt
For Gun TypeRevolverRevolver
Ammunition TypeCenterfireRimmed
Gauge/Caliber.357 Magnum, .38 Special.357 Magnum, .38 Special
Number of Rounds66
Sport/ActivityShootingShooting

