As for diferent models:
VZ-58 (actually called Sport 2003) is semi-auto version of VZ-58 with all parts of military specs on semi-auto receiver without full auto parts.
vz58s is a nick name given by the retailer for CZH2003 Sport where CZ = Ceska Zbrojovka (Czech Arms) H = Hermex S.R.O. The company that builds these clones, 2003 = the year they started getting produced.
VZ-858-2 is specially made model for Canada, which has a specially made extra long barrel that makes it non-restricted. The downside is that the barrel is not chrome lined.
CZ 858 Tactical 2 Built by the orginal sa.vz58 manufacturer CZ-UB
= Ceska Zbrojovka Uhersky Brod (Czech Arms) The CZ 858 Tactical that sells in Europe has the original chrome lined barrel the same barrel as the CZH2003S
VZ-58L is the same as VZ-858 but with chrome-lined barrel.
The VZ-58L is a nick name given by the retailer for CZH2003L Sport where CZ = Ceska Zbrojovka (Czech Arms) H = Hermex S.R.O. The company that builds these clones
Therefore the internal setup is the same for 1 and 3
Sa. VZ58
Sa. is short for Samopal which directly translated means self shooting known as machinegun
VZ is short for VZOR which means TYPE,
58 = the year it came into service