Find the minimum value of $k$ such that there exists two sequence ${a_i},{b_i}$ for $i=1,2,\cdots ,k$ that satisfies the following conditions.

(i) For all $i=1,2,\cdots ,k,$ $a_i,b_i$ is the element of $S=\{1996^n|n=0,1,2,\cdots\}.$
(ii) For all $i=1,2,\cdots, k, a_i\ne b_i.$
(iii) For all $i=1,2,\cdots, k, a_i\le a_{i+1}$ and $b_i\le b_{i+1}.$
(iv) $\sum_{i=1}^{k} a_i=\sum_{i=1}^{k} b_i.$
1. **Define the Set \( S \)**:
   The set \( S \) is given by \( S = \{1996^n \mid n = 0, 1, 2, \cdots\} \). This means \( S \) contains powers of 1996, i.e., \( S = \{1, 1996, 1996^2, 1996^3, \cdots\} \).

2. **Conditions to Satisfy**:
   - \( a_i, b_i \in S \) for all \( i = 1, 2, \cdots, k \).
   - \( a_i \neq b_i \) for all \( i = 1, 2, \cdots, k \).
   - \( a_i \leq a_{i+1} \) and \( b_i \leq b_{i+1} \) for all \( i = 1, 2, \cdots, k-1 \).
   - \( \sum_{i=1}^{k} a_i = \sum_{i=1}^{k} b_i \).

3. **Initial Assumption**:
   Let \( a_1 = 1996^x \) and \( b_1 = 1996^y \). Without loss of generality, assume \( x > y \).

4. **Modulo Condition**:
   Since \( \sum a_i \equiv 0 \pmod{1996^{y+1}} \), it follows that \( \sum b_i \equiv 0 \pmod{1996^{y+1}} \). This implies that there must be at least 1996 terms of \( 1996^y \) in the sequence \( b_i \).

5. **Minimum \( k \) Analysis**:
   - If \( k = 1996 \), then \( \sum b_i = 1996^{y+1} \leq a_1 < \sum a_i \). This inequality shows that \( k = 1996 \) is not sufficient.
   - Therefore, \( k \) must be greater than 1996.

6. **Constructing Sequences for \( k = 1997 \)**:
   - Let \( a_1 = 1996 \) and \( a_i = 1996^2 \) for \( i = 2, 3, \cdots, 1997 \).
   - Let \( b_j = 1 \) for \( j = 1, 2, \cdots, 1996 \) and \( b_{1997} = 1996^3 \).

7. **Verification**:
   - Calculate \( \sum_{i=1}^{1997} a_i \):
     \[
     \sum_{i=1}^{1997} a_i = 1996 + 1996^2 \times 1996 = 1996 + 1996^3
     \]
   - Calculate \( \sum_{i=1}^{1997} b_i \):
     \[
     \sum_{i=1}^{1997} b_i = 1996 \times 1 + 1996^3 = 1996 + 1996^3
     \]
   - Both sums are equal, satisfying the condition \( \sum_{i=1}^{k} a_i = \sum_{i=1}^{k} b_i \).

Thus, the minimum value of \( k \) that satisfies all the conditions is \( 1997 \).

The final answer is \( \boxed{1997} \).