Not really. The 737 is sorta like the Porsche 911. Same name, same shape, almost a totally different plane under the skin. When the 737NG came out in the mid-90s (-600,-700,-800,-900) is was basically a brand new airplane.
Now, 20 years, later, Boeing has just started deliveries of the new 737 MAX generation, which again brings substantial improvements.
Now, 20 years, later, Boeing has just started deliveries of the new 737 MAX generation, which again brings substantial improvements.