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Other than generally similar exterior appearances, they are about as different internally as match air rifles can be.

The Walther LGR was the first successful single-stroke pneumatic match rifle. You charge the rifle via a long lever hinged at the rear (not at the front like more modern SSP's), compressing the air on the closing stroke, then load it via a flip-up port.

The FWB 300 series are spring-piston guns that eliminate recoil via a "sledge" system. It is cocked via a rear-hinged sidelever, compressing the spring on the opening stroke, and loaded directly into the barrel via a sliding breech sleeve.

The FWB's were first made in 1963, and ruled the match-shooting world for about 15 years. The LGR came out in the late 70's and for several years was the world's most successful match air rifle at the international level, until succeeded by more modern SSP and bulk CO2 rifles around 1984.