^
It depends a little bit on the crime rate/probability in your specific area.
If bike theft is probable/likely/common, I wouldn't do it. Simply because someone could notice that you lock your bike at the same place with the same lock every day. They come prepared to break your specific type of lock, and your bike is theirs..........

If you aren't worried about this type of scenario, then I don't see a problem with it. If possible, always use two different types of locks. Even if you just leave two locked up to the rack, it is better than just one.