The Texas Ranger knife is one of 20,000 produced in 1973 for the Texas Ranger Commission. 8,000 came boxed with a S&W Model 19 and the rest are like yours. The $150 seems high to me but with eBay you never know. "Normal" price would be around $100.
The other knife is a kit knife. The parts were finished other than by S&W so you can't really say it is an authorized S&W product. Kit knives generally don't attract much interest but the kit knives from S&W also aren't seen very often. I would have no idea as to value as I am not into kit knives.
Bob