Sincerely, sincerely appreciate the help!! Going nuts trying different variations.
Switched out post_type_archive for is_singular to achieve objective.
if ( is_singular( ‘ambassadors’ ) ) {
Alternately was thinking about duplicating the top bar widget area, placing it with an if statement in the same area or below the menu bar instead of above, then just using the nav widget and choosing the menu of choice. All the css is taken care of with the nav widget