"Standards in Silhouette" and "The Ballad Style of Stan Kenton" are distinct in several ways:

1. Arrangers and Style: "Standards in Silhouette" is known for featuring exclusively the arrangements of Bill Mathieu, then a 22-year-old, which gave the album a unique sound and style different from anything else the band had played 1. In contrast, "The Ballad Style of Stan Kenton" is characterized by a more traditional Kenton approach to ballads, with arrangements that reflect the established style of the bandleader and pianist 2.

2. Musical Direction: "Standards in Silhouette" stands out for its departure from the typical big band sound, showcasing a more intimate and innovative take on jazz standards 1. On the other hand, "The Ballad Style of Stan Kenton" is more representative of the lush, romantic ballad style that Kenton was known for, with a focus on melodic beauty and emotional depth 2.

3. Historical Context: "Standards in Silhouette" was released in 1959, a time when big bands were less prominent, yet it demonstrated their enduring appeal and versatility 3. "The Ballad Style of Stan Kenton," released in 1958, captures the essence of the band's sound during the height of the big band era 2.

These differences highlight the evolution and diversity within Stan Kenton's body of work, showcasing his ability to adapt and innovate within the jazz genre.