Blue Prism have made improvements on UIA and is probably not compatible going from 6.3 to 6.1, but as BP ""promise"" compatible from 6.1 to 6.3
but i have a question, why are you importing from Production back to Development?
I'm not in your team, but i would say it is very risky business to perform this action, as you might overwrite Newer code with older code.
A release cycle should always be Dev -> Test -> Production
For your specific situation i would create a 6.3 Development environment, so you can fix the changes in this environment and then go through your release cycle again.