Leman Russes: different flavors

From left to right:
Leman Russ Demolisher: A siege tank armed with a short-ranged, but extremely powerful Demolisher cannon. Demolisher can vaporise a vehicle or a heavy infantry squad with equal ease. As well as Punisher, Demolisher has reinforced rear armor (in tabletop, anyway).
Leman Russ Vanquisher: Tank/monster hunter armed with a long-ranged anti-tank Vanquisher cannon. Shells of such cannon pierce armor nearly as well as a melta gun (which is basically a gas cutter). Also has a coaxial stormbolter.
Leman Russ Punisher: Dedicated to butchering hordes of light infantry, Punisher is armed with a Punisher Gatling Cannon - a weapon with poor armor-piercing capabilities, but insane rate of fire.
Leman Russ Executioner: Armed with a Plasma Destroyer, Leman Russ Executioner finds its purpose in melting down squads of heavy infantry.
Leman Russ Battle Tank: Because vanilla isn't a bad flavor when it comes to these armored teapots. Basic Leman Russ is armed with a Battle Cannon, a decent field gun that can deal equally well with most targets LRBT is supposed to deal with.
There are also Eradicator (Budget variation with weaker gun, but ignores cover), Annihilator (Alternative to Vanq with twin lascannons), Conqueror (Weaker gun, but faster) and Exterminator (infantry/light vehicle counter, twin autocannons).
All Leman Russ versions have very heavy front armor (can shrug off a railgun round in 50% cases), but weak rear armor. Aside from the main gun, Leman Russ carries two sponson (in this case, Plasma Cannons) and one frontal (in this case Lascannon) hardpoints, as well as can carry a Heavy Stubber (40k term for a .50 cal. MG) and a Hunter-Killer missile.