Let a $9$-digit number be balanced if it has all numerals $1$ to $9$. Let $S$ be the sequence of the numerals which is constructed by writing all balanced numbers in increasing order consecutively. Find the least possible value of $k$ such that any two subsequences of $S$ which has consecutive $k$ numerals are different from each other.
1. **Understanding the Problem:**
   We need to find the smallest integer \( k \) such that any two subsequences of length \( k \) in the sequence \( S \) are different. The sequence \( S \) is formed by writing all balanced 9-digit numbers (numbers containing each digit from 1 to 9 exactly once) in increasing order consecutively.

2. **Initial Analysis:**
   Let's start by showing that \( k \geq 17 \). Consider the first few elements of \( S \):
   \[
   123456789, 123456798, 123456879, \ldots
   \]
   The first 18 elements of \( S \) are:
   \[
   123456789123456798
   \]
   The next balanced number after \( 234567891 \) is \( 234567918 \). Hence, \( S \) also includes the sequence:
   \[
   234567891234567918
   \]
   Both of these sequences of length 18 include the subsequence \( 2345678912345679 \) of length 16. Therefore, \( k \) cannot be 16.

3. **Proving \( k = 17 \) Works:**
   We need to show that there are no identical subsequences of length 17. Assume for contradiction that there exist two identical subsequences \( X \) and \( Y \) of length 17. 

4. **Structure of Subsequences:**
   Let \( X \) and \( Y \) be represented as:
   \[
   X = \begin{tabular}{|c|c|c|}
   \hline
   $b_1, \cdots, b_y$ & $a_1, a_2, \cdots, a_9$ & $c_1, \cdots, c_x$ \\
   \hline
   \end{tabular}
   \]
   \[
   Y = \begin{tabular}{|c|c|c|}
   \hline
   $d_1, \cdots, d_z$ & $e_1, e_2, \cdots, e_9$ & $f_1, \cdots, f_t$ \\
   \hline
   \end{tabular}
   \]
   Here, \( a_1, \cdots, a_9 \) and \( e_1, \cdots, e_9 \) are full blocks, and \( x + y = 8 \) and \( z + t = 8 \).

5. **Identical Subsequence Assumption:**
   Since \( X \) and \( Y \) are identical, we have:
   \[
   b_1 = d_1, b_2 = d_2, \cdots, c_x = f_t
   \]

6. **Case Analysis:**
   If \( y = z \), then:
   \[
   (a_1, \cdots, a_9) = (e_1, \cdots, e_9)
   \]
   This implies \( X \) and \( Y \) are the same subsequences, which is a contradiction. Hence, \( y \neq z \). Without loss of generality, assume \( y > z \) and \( 8 \geq y - z = j > 0 \).

7. **Crucial Lemma:**
   Given two consecutive blocks \( K \) and \( L \) in \( S \):
   \[
   K: \boxed{p_1, \cdots, p_9}, \quad L: \boxed{q_1, \cdots, q_9}
   \]
   If the last \( i \) digits of these blocks are permutations of each other, then the first \( 9 - i \) digits are the same.

8. **Applying the Lemma:**
   Since:
   \[
   (b_{z+1}, \cdots, b_y, a_1, \cdots, a_{9-j}, a_{10-j}, \cdots, a_9) = (e_1, \cdots, e_j, e_{j+1}, \cdots, e_9, f_1, \cdots, f_j)
   \]
   We have:
   \[
   \{e_1, \cdots, e_j\} = \{a_{10-j}, \cdots, a_9\} = \{f_1, \cdots, f_j\}
   \]
   The first \( j \) elements of blocks \( E \) and \( F \) are permutations of each other. By the lemma, the last \( 9 - j \) elements of these blocks are permutations of each other. Thus, their first \( j \) elements are the same. Finally, \( b_y = e_j = f_j = a_9 \), which means the last digits of blocks \( B \) and \( A \) are the same, a contradiction.

Therefore, \( k = 17 \) is the smallest value such that any two subsequences of length \( k \) in \( S \) are different.