Absolutely..
Just 2 days ago, Tp4's spacebar was malfunctioning, intermittent..
You could tell that day, Tp4's prose came out very cranky..
The space bar has been fixed, and Tp4 am back to normal operations.
Now, that's the impact of malfunction. Overall, while there probably is a major difference in writing on switching to a new keyboard, (getting used to new key-timings), don't think over time that difference would persist. Although if such a person switches YET AGAIN to something else, it may.
It'd be similar to when people enter new relationships, they attempt to do things differently, but overtime, invariably, the settle into old habits.