Please solve the programming task below using a self-contained code snippet in a markdown code block.

Given a list of strings dict where all the strings are of the same length.
Return true if there are 2 strings that only differ by 1 character in the same index, otherwise return false.
 
Please complete the following python code precisely:
```python
class Solution:
    def differByOne(self, dict: List[str]) -> bool:
```