The k-Fibonacci sequence is a generalization of the classic Fibonacci sequence with some fixed integer k &ge 2. This study focuses on identifying all k-Fibonacci numbers that can be represented as the concatenation of three repdigits and all the k-Fibonacci numbers that can be expressed as differences of two repdigits. The proof involves the application of Baker&rsquos theory of linear forms in logarithms of algebraic numbers and the Baker-Davenport reduction procedure. 

Keywords: k&minusGeneralized Fibonacci numbers, repdigits, linear forms in logarithms, Baker-Davenport reduction method