Here's a brief synopsis of the La-5FN I found on the internet:
"The Lavochkin La-5FN was one of Russia's best fighters of WWII. Designed with non-strategic materials in mind, the La-5FN was almost entirely constructed of wood. Powered by a Shvestov M-82FN 14 cylinder radial engine with a two stage supercharger, the La-5FN boasted a maximum 1,850 horsepower and a maximum speed of 403 m.p.h. At optimum altitude. The plane was quick on the controls and could outperform any other Russian fighter before it and more importantly, almost all of its opponents. Armed with two 20mm ShVAK cannons with 200 rounds each, the La-5FN could deliver a small but effective punch. After distinguished service with the Russians in WWII, the plane went on to serve for a decade or so with various Soviet bloc countries until the jet fighter replaced it. "
And here's the rundown on the La-7:
"The La-7 was a development of the La-5, which was very similar in appearance. It was fitted with a 1850hp (1380Kw) Shvetsov radial engine. Armament was increased to three ShVak 20mm cannons. The oil radiator was moved to the lower center of the fuselage. The La-7 had increase in speed of about 10-15mph over the La-5. Due to the improvements it was preferred by many Soviet Aces for its speed, maneuverability, firepower and general performance. The La-7 prototype first flew in early 1944.
The La-7 was about 44mph faster than the FW-190 (its main nemesis). Although the La-7 was initially designed with the three-cannon arrangement, only about 368 were delivered in this configuration, compared with more than 3000 two-cannon La-7's delivered."
