What is the relationship between the 'Laghu Guru Charitra' and the 'Brihad Guru Charitra' by Saraswati Gangadhar?

According to the preface information cited in Chapter 0, the 'Laghu Guru Charitra' is a separate and distinct work from the 'Brihad Guru Charitra' written by Saraswati Gangadhar. The 'Laghu Guru Charitra' is noted to be from Wadi and consists of 707 verses. It is believed to be much older than the 'Thorale Guru Charitra' (another name for the Brihad version). Despite being separate works, they share the same protagonist: Shri Samarth Sadguru Narsimha Saraswati Maharaj. The text specifies that the 'Laghu Guru Charitra' provides the date of the protagonist's Samadhi as Shake 1140.