Is there any difference between Brand Mantra and Tagline of a particular brand?

yes, there is a big diffrence in between brand mantra and tagline of brand 

Ther's no sensible difference between brand mantra & tagline brand 

As brand essence is the “heart and soul” of the brand, its timeless quality, expressed as “adjective, adjective, noun.” Some people refer to the brand essence as the brand mantra, while for others, the brand’s mantra is synonymous with the brand’s tagline or slogan.

Here some examples 

Disney’s brand essence: Fun family entertainment

Nike’s brand essence: Authentic athletic performance

Starbuck’s brand essence: Rewarding everyday moments

These words are two sides of a coin when we talk about them but in practical they refers to different situations

Brand Mantra : The way we establish the brand in the market and keep it consistent in quality, service and satisfaction.

Tag Line : Its the short introduction of the product blended with emotional or professional attachment of the ultimate consumers.

Is  a big  difference between brand mantra and tagline of brand ,  Each special features and conditions,

A tagline is: short written statement that speaks to what you do and, ideally, why you do it. It should last a long time and works in conjunction with your name. It is read, not said.

Brand Mantra: is2-3 words that are used internally to guide decision-making.

Brand Mantra Conquers whereas Tag-line wins. 

I agree with all answers given by colleagues.